The Water Supply (Water Quality) Regulations 2001

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Statutory Instruments made by the National Assembly for Wales

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2001 No. 3911 (W.323)
WATER, ENGLAND AND WALES
The Water Supply (Water Quality) Regulations 2001

	Made	7th December 2001
	Laid before Parliament	10th December 2001
	Coming into force in accordance with regulation 1(2) to (5)

ARRANGEMENT OF REGULATIONS

PART I
General

1.	Citation, commencement and application

2.	Interpretation

PART II
Water Supply Zones

3.	Water supply zones

PART III
Wholesomeness

4.	Wholesomeness

PART IV
Monitoring of Water Supplies

5.	Interpretation and application

6.	Monitoring: general provisions

7.	Sampling points

8.	Authorisation of supply points

9.	Numbers of samples

10.	Sampling: further provisions

PART V
Monitoring: Additional Provisions

11.	Interpretation

12.	Sampling for particular substances and parameters

13.	Sampling at treatment works

14.	Sampling at service reservoirs

15.	Sampling: new sources

16.	Collection and analysis of samples

PART VI
Investigations, Authorisation of Departures and Remedial Action

17.	Investigations: Schedule 1 parameters

18.	Investigations: indicator parameters

19.	Action by National Assembly for Wales

20.	Authorisation of temporary supply of water that is not wholesome

21.	Authorisations: terms and conditions

22.	Authorisations: other limitations

23.	Publicity for authorisations

24.	Revocations and modification of authorisations

PART VII
Water Treatment

25.	Interpretation

26.	Treatment of raw water

27.	Risk assessment for cryptosporidium

28.	Procedure following risk assessment, and prohibition of supply

29.	Treatment for cryptosporidium

30.	Contamination from pipes

31.	Application and introduction of substances and products

32.	Use of processes

33.

Offences

PART VIII
Records and Information

34.	Maintenance of records

35.	Provision of information

36.	Publication of information

PART IX
Functions of Local Authorities in Relation to Water Quality

37.	Application and interpretation

38.	Duties of local authorities: supplementary provision

PART X
Enforcement

39.	Contraventions by water undertakers

PART XI
Amendment and Revocation of Regulations and Saving and Transitional Provision

40.	Amendment of the Water Supply (Water Quality) Regulations 1989

41.	Transitional provision: programmes of work

42.	Transitional provision: authorisations

43.	Revocation of Regulations and savings

SCHEDULES

Prescribed concentrations and values

Table A -

Microbiological parameters

Parameters and circumstances for check monitoring

Table 2 -

Annual sampling frequencies: water supply zones

Table 3 -

Annual sampling frequencies: treatment works or supply points

Analytical methodology

Amendment of the Water Supply (Water Quality) Regulations 1989

Programmes of work

The National Assembly for Wales, in exercise of the powers conferred upon it by sections 67, 69, and 213(2) of the Water Industry Act 1991[1], and, in relation to Wales, section 77(3) and (4) of that Act[2], and in exercise of all other powers enabling it in that behalf, hereby makes the following Regulations:

PART I
GENERAL
Citation, commencement and application
     1. - (1) These Regulations may be cited as the Water Supply (Water Quality) Regulations 2001.

    (2) This regulation, regulations 2, 25, 27 to 29, 39, 40 and 41, paragraph (1) of regulation 43, and so much of regulation 33 as relates to any contravention of paragraph (9) of regulation 28 or any contravention of a provision of regulation 29, shall come into force on 1st January 2002.

    (3) Regulations 3 and 42 shall come into force on 1st June 2003.

    (4) Regulations 4 and 17 to 24, paragraphs (4) and (5) of regulation 30, and paragraph (2) of regulation 43, shall come into force on 25th December 2003.

    (5) All other provisions of these Regulations shall come into force on 1st January 2004.

    (6) Parts I to VIII, X and XI of these Regulations apply in relation to the supply of water by water undertakers whose areas are wholly or mainly in Wales.

    (7) Part IX of these Regulations applies to local authorities in Wales, as regards the discharge of functions under that Part in relation to water undertakers -

Interpretation
2. - (1) In these Regulations -

"the Act" means the Water Industry Act 1991;

"the 1989 Regulations" means the Water Supply (Water Quality) Regulations 1989[

"appropriate local authority" and "appropriate health authority", in relation to a departure authorised under regulation 20 or 21, or an application for any such authorisation, means the local authority and the health authority, respectively, whose area contains any part of the water supply zone to which the authorisation relates or, in the case of an application, would apply if a departure were authorised in the terms sought;

"blending point" means a point at which water originating from two or more sources and treated for the purposes of their supply for regulation 4(1) purposes are combined under conditions that are designed to secure that, after such combination, the requirements of paragraph (2) of regulation 4 are met;

"Chapter III" means Chapter III (quality and sufficiency of supplies) of Part III (water supply) of the Act;

"consumer" means a person to whom water is supplied for regulation 4(1) purposes by a water undertaker in the discharge of its duties under Chapter III;

"disinfection" means a process which removes or renders inactive pathogenic micro-organisms so as to satisfy the requirements of Part III of these Regulations in respect of micro-organisms (other than parameters), parasites and the parameters listed in Table A in Schedule 1 to these Regulations; and "disinfected" shall be construed accordingly;

"indicator parameter" means a parameter listed in Schedule 2;

"local authority" means any of the following -

"parameter" means a property, element, organism or substance listed in the second column of Table A or Table B in Schedule 1 to these Regulations, or in Schedule 2, as read, where appropriate, with the notes to Schedule 2 and those Tables;

"pesticides and related products" means -

and includes their relevant metabolites, degradation and reaction products;

"prescribed concentration or value", in relation to any parameter, means the maximum or minimum concentration or value specified in relation to that parameter in Table A or Table B in Schedule 1 as measured by reference to the unit of measurement so specified, and as read, where appropriate, with the notes to those Tables;

"regulation 4(1) purposes", in relation to the supply of water, means a supply -

"sampling point" -

"specification", in relation to an indicator parameter, means the concentration, value or state, shown as applicable to that parameter in Schedule 2 as measured by reference to the unit of measurement so shown;

"state", in relation to an indicator parameter, means the state specified in relation to that parameter in Schedule 2 as measured by reference to the unit of measurement so specified;

"supply point" means a blending point, service reservoir, treatment works or other point, not being a sampling point, which the National Assembly for Wales authorises for the purposes of regulation 6;

"water supply zone", in relation to a water undertaker and a year, means an area designated for that year by the water undertaker in accordance with regulation 3; and

"year" means calendar year.

    (2) Other expressions used both in these Regulations and in Council Directive 98/83/EC (on the quality of water intended for human consumption)[7] have the same meaning in these Regulations as they have in that Directive.

    (3) Subject to paragraph (4), references in these Regulations to a service reservoir are references to any structure, other than a structure at a treatment works, in which a reserve of water that has been treated with a view to complying with the requirements of regulation 4 is contained and stored for the purpose of meeting a variable demand for the supply of water.

    (4) Where references in these Regulations to a service reservoir would, but for this paragraph, include references to a structure comprising more than one compartment -

PART II
WATER SUPPLY ZONES
Water supply zones
     3. - (1) Before the beginning of each year in which it intends to supply water for regulation 4(1) purposes, a water undertaker shall designate the names and areas within its area of supply that are to be its water supply zones for that year.

    (2) A water supply zone may not comprise an area whose population immediately before the beginning of the year in question is estimated by the water undertaker to exceed 100,000.

    (3) A water undertaker may not vary a designation under paragraph (1) after the beginning of the year in relation to which the designation has effect.

PART III
WHOLESOMENESS
Wholesomeness
     4. - (1) Water supplied -

shall, subject to paragraphs (4) and (5), be regarded as wholesome for the purposes of Chapter III, as it applies to the supply of water for those domestic purposes, if the requirements of paragraph (2) are satisfied.

(2) The requirements of this paragraph are -

at a concentration or value which would constitute a potential danger to human health;

(b) that the water does not contain any substance (whether or not a parameter) at a concentration or value which, in conjunction with any other substance it contains (whether or not a parameter) would constitute a potential danger to human health;

(c) that the water does not contain concentrations or values of the parameters listed in Tables A and B in Schedule 1 in excess of or, as the case may be, less than, the prescribed concentrations or values;

(d) that the water satisfies the formula [nitrate]/50 + [nitrite]/3 ≤ 1, where the square brackets signify the concentrations in mg/l for nitrate (NO₃) and nitrite (NO₂).

(3) The point at which the requirements of paragraph (2), in so far as they relate to the parameters set out in Part I of Table A and in Table B in Schedule 1 are to be complied with is -

(4) Water supplied for regulation 4(1) purposes shall not be regarded as wholesome for the purposes of Chapter III if, on transfer from a treatment works for supply for those purposes -

E. coli

₂

(5) Subject to paragraph (6), water supplied for regulation 4(1) purposes shall not be regarded as wholesome for the purposes of Chapter III if, on transfer from a service reservoir for supply for those purposes, it contains a concentration of the coliform bacteria or E.coli parameter in excess of the prescribed concentrations.

(6) Water transferred from a service reservoir for supply for regulation 4(1) purposes shall not be regarded as unwholesome for the purposes of Chapter III because the maximum concentration for the coliform bacteria parameter is exceeded if, as regards the samples taken in any year in which the reservoir in question is in use, the results of analysis for that parameter establish that in at least 95 per cent of those samples coliforms were absent.

PART IV
MONITORING OF WATER SUPPLIES
Interpretation and application of Part IV
5. - (1) In this Part "audit monitoring" means monitoring for the purpose of obtaining information from which it may be established -

(2) In this Part, "check monitoring" means monitoring for the purpose of obtaining information at regular intervals -

for the purpose of determining -

    (3) This Part applies to water supplied for regulation 4(1) purposes by a water undertaker in the performance of its duties under Chapter III.

Monitoring: general provisions
     6. - (1) For the purpose of determining whether water to which this Part applies satisfies the provisions of Part III or, if a departure has been authorised under Part VI in relation to that supply, those provisions as read with the terms of that authorisation, a water undertaker shall take, or cause to be taken, and analyse, or cause to be analysed, not less than the number of samples of the water within each of its water supply zones specified in, or in accordance with provisions of, this Part.

    (2) Except in a case to which paragraph (3) applies, the parameters listed in Tables A and B in Schedule 1 and the indicator parameters shall be subject -

(a) as regards a parameter listed in column (2) of Table 1 in Schedule 3, in relation to which there is no entry in column (3) of that Table, to check monitoring;

(b) as regards a parameter so listed in relation to which there is an entry in column (3), check monitoring in the circumstances specified in that column;

(c) in any other case, audit monitoring.

(3) Where -

(a) the distribution of water in any part of a water supply zone is by tanker; and

(b) is or is likely to be an intermittent short-term supply,

samples of water from each tanker from which water is distributed shall be taken 48 hours after the commencement of the distribution from that tanker and every 48 hours thereafter until the distribution is discontinued.

    (4) Of the samples taken in accordance with paragraph (3) in relation to each distribution, the first shall be analysed for compliance with the parameters E. coli, hydrogen ion and conductivity (item 2 in Table A in Schedule 1, item 3 in Part II of Table B in that Schedule and item 6 in Schedule 2, respectively), and the second and any subsequent samples shall be analysed for compliance with those and every other parameter.

    (5) For the purposes of the application of paragraph (2)(b) to the aluminium, Clostridium perfringens, iron and manganese parameters (items 1, 3, 9 and 10 in Table 1 in Schedule 3), a supply which consists of both ground water and surface water shall be deemed to be a supply which consists only of surface water.

    (6) The copper, lead and nickel parameters and, subject to paragraph (7), the parameters relevant to radioactivity (total indicative dose and tritium), shall be monitored in such manner as the National Assembly for Wales shall determine from time to time and shall specify by notice in writing given to each water undertaker.

    (7) If, in relation to any water supply zone, the National Assembly for Wales is satisfied that water supplied to that zone for regulation 4(1) purposes -

(a) gives rise to a calculated total indicative dose in respect of radioactivity that is well below the specification; or

(b) contains levels of tritium that are well below the specification,

it shall notify the water undertaker which supplies water to that zone that the total indicative dose parameter (item 8 in Schedule 2) or, as the case may be, the tritium parameter (item 10 in that Schedule) need not be monitored.

(8) The National Assembly for Wales shall, by notice in writing -

(a) withdraw a notice under paragraph (7) given in relation to the total indicative dose parameter if it believes that water supplied to the zone in question for regulation 4(1) purposes gives rise to a calculated total indicative dose in respect of radioactivity that is not well below the specification;

(b) withdraw a notice under paragraph (7) given in relation to the tritium parameter if it believes that water supplied to the zone in question for regulation 4(1) purposes contains levels of tritium that are not well below the specification.

    (9) A water undertaker which receives a notice under paragraph (8) shall then monitor the total indicative dose parameter or, as the case may be, the tritium parameter in accordance with the notice having effect for the time being under paragraph (6).

Sampling points
     7. Except in relation to water supplied from a tanker, sampling points in respect of every parameter, other than a parameter for which samples are taken from a supply point authorised by or under regulation 8, shall be selected at random unless, by notice in writing to a water undertaker (whether or not on the application of the water undertaker), the National Assembly for Wales otherwise determines.

Authorisation of supply points
     8. - (1) The National Assembly for Wales, being satisfied that analysis of samples taken from -

(a) any blending point;

(b) the water leaving any service reservoir which receives water from a treatment works before its supply to any consumer; and

(c) the water leaving any treatment works,

will produce data in respect of the parameters specified as items 7, 8 and 9 to 25 in column (1) of Table 3 in Schedule 3 which are unlikely to differ in any material respect from the data that would be produced in respect of those parameters from analysis of samples obtained from sampling points, hereby authorises the use for the purposes of regulation 6 of samples in relation to those parameters taken for a water supply zone from a blending point, a service reservoir of that description or a treatment works.

    (2) Subject to paragraph (3), the National Assembly for Wales may, in relation to any parameter other than a parameter referred to in paragraph (1), on the written application of a water undertaker, authorise the use for the purposes of regulation 6 of samples taken for a water supply zone otherwise than from a sampling point; and any such authorisation may extend to all samples in relation to that parameter or to such number or proportion of those samples as is specified in the authorisation.

    (3) The National Assembly for Wales shall not grant an authorisation under paragraph (2) unless it is satisfied that analysis of samples taken from a point other than a sampling point will produce data in respect of the parameter in question which are unlikely to differ in any material respect from the data that would be produced in respect of that parameter from analysis of samples obtained from sampling points.

    (4) Subject to paragraph (5), the National Assembly for Wales may at any time modify or revoke an authorisation under paragraph (2).

    (5) Unless it appears to the National Assembly for Wales that the immediate modification or revocation of an authorisation under paragraph (2) is required in the interests of public health, it shall not modify or revoke such an authorisation without giving to the water undertaker to which the authorisation relates at least six weeks' notice of its intention to modify or revoke.

    (6) A water undertaker shall notify the National Assembly for Wales as soon as it has reasonable grounds for believing that an analysis of samples taken for a water supply zone from a point other than a sampling point would produce data in respect of the parameter in question which would differ in a material respect from the data produced by an analysis of samples taken from any of the sampling points within that zone; and the National Assembly for Wales shall thereupon, and without the need for prior notice to the water undertaker, revoke the authorisation.

Numbers of samples
     9. - (1) Subject to paragraph (2), in each year a water undertaker shall take, or cause to be taken -

(a) from its sampling points; or

(b) to the extent authorised by or under regulation 8, from its supply points, the standard number of samples for analysis as regards residual disinfectant and each parameter listed in column (1) of Table 2 in Schedule 3 or, as the case may be, Table 3 in that Schedule.

(2) Where, in respect of a parameter subject to check monitoring -

(a) a water undertaker is of the opinion that the quality of water supplied by it to a water supply zone is unlikely to deteriorate; and

(b) in each of two successive years the results of samples taken, subject to paragraph (3), in accordance with these Regulations show no significant variation and -

the number of samples to be taken in the following year for that parameter may be the reduced number.

    (3) Where the following year is 2004, paragraph (2)(b) shall apply as if for "these Regulations" there were substituted "the 1989 Regulations"; and where the following year is 2005, paragraph (2)(b) shall apply as if before "these Regulations" there were inserted "the 1989 Regulations and".

    (4) Samples required to be taken by this regulation shall be taken at regular intervals.

    (5) In this regulation -

(a) in relation to sampling points, residual disinfectant or a parameter and the supply of water to an estimated population within one of the ranges shown in column (2) of Table 2 in Schedule 3, "the standard number" and "the reduced number" means the number shown in column (4) and column (3), respectively, of that Table as applicable to that substance or parameter by reference to a population within that range;

(b) in relation to supply points, each of the parameters specified as items 7, 8 and 9 to 25 in column (1) of Table 3 in Schedule 3, and the supply of a volume of water within one of the ranges shown in column (3) of that Table, "the standard number" and "the reduced number" means, subject to sub-paragraph (c), the number shown in column (5) and column (4), respectively, of that Table as applicable to that parameter by reference to a volume supplied within that range; and

(c) where a particular supply point is in use for part only of a year, "the standard number" and "the reduced number" means the number that bears to the number shown in column (5) and column (4), respectively, of Table 3, the same proportion as the number of days in that year in which the supply point has been in use bears to 365.

Sampling: further provisions
10. As soon as a water undertaker has reasonable grounds for believing that any element, organism or substance, other than residual disinfectant or a parameter, whether alone or in combination with a parameter or any other element, organism or substance, may cause the supply within any of its water supply zones to be a supply which does not satisfy -

(a) the provisions of Part III of these Regulations or,

(b) if a departure has been authorised under Part VI, those provisions as read with the terms of that authorisation,

it shall take, or cause to be taken, sufficient samples from water within that zone (whether from a service reservoir, a treatment works or otherwise) in respect of that element, organism or substance, in order to establish whether that water is wholesome.

PART V
MONITORING - ADDITIONAL PROVISIONS
Interpretation of Part V
     11. In this Part, in relation to residual disinfectant or a parameter specified as item 1, 2, 3, 4 or 6 in column (1) of Table 3 in Schedule 3, and the supply of a volume of water within one of the ranges shown in column (3) of that Table, "the standard number" and "the reduced number" means the number shown in column (5) and column (4), respectively, of that Table as applicable to residual disinfectant or the parameter in question by reference to a volume of water within that range.

Sampling for particular substances and parameters
     12. For the purposes of establishing the quality of water to be supplied to any of its water supply zones, a water undertaker shall take, or cause to be taken, and analyse, or cause to be analysed, not less than the number of samples specified in this Part.

Sampling at treatment works
     13. - (1) Subject to paragraphs (2), (4) and (6), in each year a water undertaker shall take, or cause to be taken, from the point at which water leaves each treatment works which serves its water supply zones, the standard number of samples for analysis -

E. coli

(2) Where in each of two successive years the results of the analysis of samples taken, subject to paragraph (3), in accordance with these Regulations have established -

E. coli

the number of samples to be taken in respect of that parameter in the next following year from the point at which water leaves that treatment works may, subject to paragraph (4), be the reduced number.

(3) Paragraph (2) shall apply -

(4) In respect of the coliform bacteria parameter and the E. coli parameter, the reduced number of samples may be taken in accordance with paragraph (2) only if the water undertaker is of the opinion -

    (5) Samples required to be taken by this regulation shall be taken at regular intervals.

    (6) Where a particular treatment works is in use for part only of a year, the minimum number of samples to be taken from that works in that year shall bear to the standard number or, as the case may be, the reduced number, the same proportion as the number of days in that year in which the treatment works have been in use bears to 365.

Sampling at service reservoirs
     14. A water undertaker shall take, or cause to be taken, from each of its service reservoirs in each week in which the reservoir is in use, one sample for analysis -

(a) for testing for compliance with the prescribed concentrations or values in respect of the parameters E. coli and coliform bacteria;

(b) for determining the concentration of residual disinfectant; and

(c) for determining whether the specification in relation to the colony counts parameter is met.

Sampling: new sources
15. - (1) This regulation applies as respects -

(a) any source which has not been used for the supply of water by a water undertaker at any time since 1st January 2004; and

(b) any source which has been so used but not so used for a period of six months preceding the date on which the water undertaker proposes to supply water from it.

(2) A water undertaker shall -

(a) before it supplies water from a source mentioned in paragraph (1)(a); and

(b) as soon as is reasonably practicable after it has begun to supply water from a source mentioned in paragraph (1)(b),

take, or cause to be taken, in accordance with paragraph (3), such samples of that water as will enable it to establish -

(aa) whether water can be supplied from that source without contravening section 68(1) of the Act; and

(bb) the treatment necessary to ensure that section 68(1) of the Act is complied with in relation to the supply of that water.

(3) Samples shall be taken -

(a) in the case of a source mentioned in paragraph (1)(a), in respect of -

(b) in the case of a source mentioned in paragraph (1)(b), in respect of -

Collection and analysis of samples
16. - (1) A water undertaker shall secure, so far as is reasonably practicable, that in taking, handling, transporting, storing and analysing, any sample required to be taken for the purposes of Part IV or this Part of these Regulations, or causing any such sample to be taken, handled, transported, stored and analysed, the appropriate requirements are satisfied.

(2) In paragraph (1) "the appropriate requirements" means such of the following requirements as are applicable -

(a) the sample is representative of the quality of the water at the time of sampling;

(b) the sample is not contaminated when being taken;

(c) the sample is kept at such temperature and in such conditions as will secure that there is no material alteration of the concentration or value for the measurement or observation of which the sample is intended;

(d) the sample is analysed as soon as may be after it has been taken -

(e) any laboratory at which samples are analysed has a system of analytical quality control that is subjected from time to time to checking by a person who is -

    (3) For the purposes of paragraph (2)(e), "laboratory" means a person who undertakes the analysis of samples for the purposes of this Part, whether at the time and place at which the samples are taken or otherwise.

    (4) A water undertaker shall maintain such records as are sufficient to enable it to establish, in relation to each sample taken for the purposes of Part IV or this Part, that such of the appropriate requirements as are applicable to that sample have been satisfied.

    (5) Subject to paragraph (7), for the purpose of establishing, within acceptable limits of deviation and detection, whether the sample contains concentrations or values which contravene the prescribed concentrations or values, or exceed the specifications for indicator parameters -

(a) the method of analysis specified in column (2) of Table A1 in Schedule 4 shall be used for the parameter specified in relation to that method in column (1);

(b) the method of analysis used for a parameter specified in column (1) of Table A2 in that Schedule must be capable, at the time of use -

(c) the method of analysis used for determining compliance with the hydrogen ion parameter must be capable, at the time of use, of measuring concentrations equal to the parametric value with a trueness of 0.2 pH unit and a precision of 0.2 pH unit; and

(d) the method of analysis used for the odour and taste parameters must be capable, at the time of use, of measuring values equal to the parametric value with a precision of 1 dilution number at 25°C.

(6) For the purposes of paragraph (5) -

"limit of detection" is to be calculated as -

(a) three times the relative within batch standard deviation of a natural sample containing a low concentration of the parameter; or

(b) five times the relative within batch standard deviation of a blank sample;

"precision" (the random error) is to be calculated as twice the standard deviation (within a batch and between batches) of the spread of results about the mean; and

"trueness" (the systematic error) is to be calculated as the difference between the mean value of the large number of repeated measurements and the true value.

(7) Subject to paragraph (9), the National Assembly for Wales may, on the application of any person, authorise a method of analysis other than that specified in paragraph (5)(a) ("the prescribed method").

(8) An application for the purposes of paragraph (7) shall be made in writing and shall be accompanied by -

(a) a description of the method of analysis; and

(b) the results of the tests carried out to demonstrate the reliablity of that method and its equivalence to the prescribed method.

    (9) The National Assembly for Wales shall not authorise the use of the method proposed in the application unless it is satisfied that the results obtained by the use of that method are at least as reliable as those produced by the use of the prescribed method.

    (10) An authorisation under paragraph (7) may be subject to such conditions as the National Assembly for Wales thinks fit.

    (11) The National Assembly for Wales may at any time, by notice in writing served on the water undertaker to which an authorisation under paragraph (7) has been given, revoke the authorisation, but no such notice shall be served later than three months before the date on which the revocation is stated to take effect.

PART VI
INVESTIGATIONS, AUTHORISATION OF DEPARTURES AND REMEDIAL ACTION
Investigations: Schedule 1 parameters
17. - (1) Subject to paragraph (3), where a water undertaker has reason to believe that water supplied by it for regulation 4(1) purposes -

the water undertaker shall immediately take such steps as are necessary to identify the matters specified in paragraph (2) below.

(2) The matters referred to in paragraph (1) are -

(3) Where a departure has been authorised under Part VI -

(4) The matters referred to in paragraph (3) are -

(5) As soon as may be after the matters specified in paragraph (2) or (4), as the case may be, have been identified, the water undertaker shall notify the National Assembly for Wales -

(6) Where the water undertaker has identified a failure attributable to the domestic distribution system or to the maintenance of that system, it shall, at the same time as notification is given under paragraph (5) -

inform them of the nature of the failure and provide details of the steps (if any) that, in the opinion of the water undertaker, it is necessary or desirable for those consumers to take in the interests of their health; and

(b) send a copy of that notice to the National Assembly for Wales and to each appropriate local authority.

    (7) A water undertaker which has complied with the requirements of paragraphs (5) and (6) need not, in respect of the same failure or apprehended failure, comply with the requirements of regulation 35(9).

    (8) Where such a failure as is mentioned in paragraph (6) affects the supply of water to the public in premises in which water is so supplied, the water undertaker shall, as soon as may be, notify such persons as the National Assembly for Wales may from time to time determine for the purposes of this paragraph of the matters of which notice is given to consumers in accordance with paragraph (6)(a).

    (9) Where such a failure as is mentioned in paragraph (1) relates to the copper or lead parameter, the water undertaker shall, as soon as reasonably practicable after the occurrence, modify or replace such of its pipes and their associated fittings as it knows or has reason to believe have the potential for contributing to copper or lead in the water supplied to the premises, so as to eliminate that potential (whether or not the presence of copper or lead in those pipes contributed to the failure).

Investigations: indicator parameters
     18. - (1) Where a water undertaker has reason to believe that water supplied by it for regulation 4(1) purposes does not meet the specifications for indicator parameters set out in Schedule 2, it shall take such steps as are necessary to identify -

(a) the reason why the specifications are not met;

(b) the indicator parameters in respect of which the specifications are not met; and

(c) if the specification for the coliform bacteria or colony counts parameter (items 4 and 5 in Schedule 2) is not met, whether the inability to meet that specification is attributable -

(2) As soon as may be after the matters specified in paragraph (1) have been identified, the water undertaker shall notify the National Assembly for Wales -

(a) of those matters; and

(b) in relation to each parameter identified in accordance with paragraph (1)(b), whether it is the opinion of the water undertaker that a recurrence of the inability to meet the specification in respect of that parameter is likely.

(3) Where, in a case to which paragraph (1)(c) applies, the inability to meet the specification has been identified as attributable to the domestic distribution system or to the maintenance of that system, the water undertaker shall, at the same time as notification is given under paragraph (2) -

(a) by notice in writing to those of its consumers -

inform them of the nature of the problem and provide details of the steps (if any) that, in the opinion of the water undertaker, it is necessary or desirable for those consumers to take in the interests of their health; and

(b) send a copy of that notice to the National Assembly for Wales and to each appropriate local authority.

(4) Where such an inability as is mentioned in paragraph (3) is, in the opinion of the water undertaker, likely to affect the supply of water to the public in premises in which water is so supplied, it shall, at the same time as notice is given under paragraph (2), notify such persons as the National Assembly for Wales may from time to time determine for the purposes of this paragraph of the matters of which notice is given to consumers in accordance with paragraph (3)(a).

Action by National Assembly for Wales
19. - (1) Where -

(a) a notification given in accordance with paragraph (5) of regulation 17 in the circumstances mentioned in paragraph (1) of that regulation (including that paragraph as read with paragraph (3)(a) of that regulation) discloses -

(b) it appears to the National Assembly for Wales that the failure is not trivial and is likely to recur,

the National Assembly for Wales may, by notice in writing to the water undertaker, require the water undertaker to seek a departure in accordance with regulation 20.

(2) The exercise by the National Assembly for Wales of the power conferred by paragraph (1) shall not preclude the exercise by it, in relation to the same circumstances, of the power conferred by section 18 of the Act.

(3) Where -

(a) a notification given in accordance with paragraph (5) of regulation 17 in the circumstances mentioned in paragraph (3)(b) of that regulation discloses -

(b) it appears to the National Assembly for Wales that the failure in respect of that parameter is not trivial and is likely to recur,

the National Assembly for Wales shall consider whether the terms of the authorisation under regulation 20 should be modified.

(4) Where -

(a) a notification given in accordance with regulation 18(2) discloses an inability to meet the specification applicable to an indicator parameter; and

(b) the National Assembly for Wales considers that the inability poses a risk to human health;

the National Assembly for Wales may, by notice in writing to the water undertaker, require the water undertaker to take such steps as may be determined by the National Assembly for Wales and specified in the notice.

(5) It shall be the duty of a water undertaker to which a notice under paragraph (4) has been given to take the steps specified in the notice.

Authorisation of temporary supply of water that is not wholesome
20. - (1) Subject to paragraph (2), the National Assembly for Wales may, upon the written application of a water undertaker, authorise in accordance with regulation 21 a departure from the provisions of Part III of these Regulations in so far as they relate to -

(a) a parameter specified in Part II of Table A or in Table B in Schedule 1; and

(b) the supply of water by that undertaker in any of its water supply zones.

(2) The National Assembly for Wales shall not authorise a departure under paragraph (1) unless it is satisfied -

(a) that the authorisation is necessary to maintain in that zone a supply of water for regulation 4(1) purposes;

(b) that a supply of water for those purposes cannot be maintained in that zone by any other reasonable means; and

(c) that the supply of water in accordance with the authorisation does not constitute a potential danger to human health.

(3) A water undertaker shall provide with its application -

(a) a statement -

(b) a scheme for monitoring the quality of water supplied in the zone during the period for which the authorisation is sought; and

(c) a summary of the steps that it proposes to take in order to secure that the supply fully satisfies the requirements of Part III, including -

(4) At the same time as it makes an application for an authorisation under paragraph (1), the water undertaker shall serve on -

(a) every appropriate local authority;

(b) every appropriate health authority; and

(c) the relevant customer services committee,

a copy of the application and of the statement, scheme and summary referred to in paragraph (3).

    (5) A body on whom documents have been served in accordance with paragraph (4) may make representations to the National Assembly for Wales in connection with the application; and any such representations shall be made not later than the end of the period of 30 days beginning with the date on which the application for the authorisation is made.

Authorisations: terms and conditions
     21. - (1) Subject to paragraph (2), a departure may be authorised under regulation 20 for such period as is in the National Assembly for Wales's opinion reasonably required for securing a supply of water for regulation 4(1) purposes that fully satisfies the requirements of Part III ("the departure period").

    (2) No departure period may exceed three years.

    (3) Subject to paragraph (4), an authorisation under regulation 20 -

(a) shall specify -

(b) shall require the implementation of a scheme for monitoring the quality of water supplied in each of those zones during the departure period (which may be, but need not be, the scheme submitted in accordance with regulation 20(3)(b)); and

(c) shall require the carrying out of the steps which, in its opinion, are reasonably required in order to secure that the supply fully satisfies the requirements of Part III (whether or not the steps are those proposed in the summary submitted in accordance with regulation 20(3)(c)); and

(d) shall specify, in relation to those steps -

(e) shall require the taking of such steps as may be specified to give to the population within the water supply zones to which the authorisation applies and, in particular, to those groups of that population for which the supply of water in accordance with the authorisation could present a special risk, advice as to the measures (if any) that it would be advisable in the interests of their health for persons within that population or those groups to take for the whole or any part of the departure period.

(4) Where the National Assembly for Wales is of the opinion -

(a) that the extent of the contravention of the requirements of Part III as respects any parameter is trivial; and

(b) that the prescribed concentration or value as respects that parameter is likely to be achieved within the period of 30 days beginning with the day on which the prescribed concentration or value in respect of that parameter was contravened,

the particulars to be specified in the authorisation shall be those required by paragraph (3)(a)(iii) and (ix), and sub-paragraphs (b) to (e) of that paragraph shall not apply.

    (5) Where it appears to the National Assembly for Wales that a supply of water that fully satisfies the requirements of Part III cannot be restored by the end of the departure period, it may authorise a further departure.

    (6) Paragraphs (1) to (4) shall apply to a further departure as they apply to a departure authorised under regulation 20.

    (7) Where it appears to the National Assembly for Wales that a supply of water that fully satisfies the requirements of Part III cannot be restored by the end of the departure period relevant to an authorisation under paragraph (5), it may, in accordance with Article 9(2) of Council Directive 98/83/EEC, authorise a third departure.

    (8) Paragraph (3) shall apply to a departure authorised under paragraph (7) as it applies to a departure authorised under regulation 20, but with the substitution for the words "Subject to paragraph (4)" of the words "Subject to any direction of the Commission".

Authorisations: other limitations
     22. An authorisation under regulation 20 or regulation 21 may be limited to water supplied -

(a) from particular sources or classes of source;

(b) to particular water supply zones or to zones of particular descriptions.

Publicity for authorisations
23. As soon as reasonably practicable after a departure has been authorised, the water undertaker shall -

(a) publish in a newspaper circulating in the area in which the water supply zone to which the authorisation relates is situated -

(b) give such other public notice of the authorisation and of its terms and conditions as the National Assembly for Wales may, by notice in writing to the undertaker, reasonably require.

Revocation and modification of authorisations
24. - (1) Subject to paragraphs (2) and (3), the National Assembly for Wales may at any time modify or revoke an authorisation under regulation 20.

(2) The National Assembly for Wales shall not revoke or modify an authorisation under regulation 20 without giving at least six months' notice in writing of its intention to do so to -

(a) the water undertaker to which the authorisation relates;

(b) the appropriate local authority;

(c) the appropriate health authority; and

(d) the relevant customer services committee,

but it may revoke or modify an authorisation without notice if it appears to it that immediate revocation or modification is required in the interests of public health.

(3) A water undertaker on whose application a departure has been authorised under this Part shall notify the National Assembly for Wales as soon as the circumstances which gave rise to the application cease to exist; and the National Assembly for Wales shall thereupon revoke the authorisation without the need for prior notice.

PART VII
WATER TREATMENT
Interpretation
25. In this Part -

"regulation 29 requirements" means the requirements of paragraphs (2) and (4) of regulation 29;

"risk assessment", in relation to a treatment works, means an assessment for that treatment works, to establish whether there is, or continues to be, a significant risk from cryptosporidium oocysts in water supplied from the works;

"significant risk from cryptosporidium", in relation to water supplied from a treatment works, means a significant risk that the average number of cryptosporidium oocysts per 10 litres of water supplied from the works for regulation 4(1) purposes, if sampled and analysed in accordance with regulation 29(5) to (15), would at any time be one or more; and

"surface water" does not include water from a spring.

Treatment of raw water
     26. - (1) In carrying out such of its functions under Chapter III as comprise the supply of water for regulation 4(1) purposes, a water undertaker shall not, subject to paragraph (2), supply water from any source which consists of or includes raw water unless the water has been disinfected and, in the case of surface water, subjected to at least such further treatment as is specified in paragraph (3).

    (2) Paragraph (1) shall not require a water undertaker to disinfect such groundwaters as are specified in an authorisation given by the National Assembly for Wales for the purposes of this paragraph.

    (3) The further treatment mentioned in paragraph (1) is such treatment as is required to secure compliance with Council Directive 75/440/EC (quality required of surface water intended for the abstraction of drinking water)[8]; and for the purposes of this regulation, surface water shall be treated as falling within category A1 or A2 or A3 set out in Annex I to that Directive if it is abstracted from waters for which the classification to be currently satisfied in accordance with section 82(1) of the Water Resources Act 1991[9] is, as appropriate, DW1 or DW2 or DW3, as set out in the Surface Waters (Abstraction for Drinking Water) (Classification) Regulations 1996[10].

    (4) Except with the consent of the National Assembly for Wales, water shall not be abstracted for supply for regulation 4(1) purposes which include drinking except from waters to be treated as falling within category A1 or A2 or A3 in the Annex mentioned in paragraph (3).

Risk assessment for cryptosporidium
     27. - (1) Where at any time before 1st January 2002 a water undertaker has been required to comply with regulation 23B of the 1989 Regulations[11] at a treatment works, it may on or after that date carry out a risk assessment.

    (2) Where a risk assessment has not been submitted to the National Assembly for Wales pursuant to regulation 23A(1) of the 1989 Regulations, in respect of any treatment works from which water was first supplied for regulation 4(1) purposes after 30th June 1999[12] and before 1 January 2002, the water undertaker operating that works shall carry out a risk assessment on or before 28 February 2002.

    (3) Where, at any time after 31 December 2001, a water undertaker proposes to bring into operation a treatment works from which it intends to supply water for regulation 4(1) purposes, it shall carry out a risk assessment in respect of that works.

    (4) Where a water undertaker becomes aware of any factors which make it likely that a risk assessment will establish that there is a significant risk from cryptosporidium it shall notify the National Assembly for Wales in writing, specifying the relevant factors.

    (5) The National Assembly for Wales may at any time by notice in writing require a water undertaker to carry out a risk assessment by a date specified in the notice to establish whether there is a significant risk from cryptosporidium.

Procedure following risk assessment, and prohibition of supply
     28. - (1) Where a water undertaker carries out a risk assessment under any provision of regulation 27, it shall submit to the National Assembly for Wales a report of the assessment.

    (2) A report of a risk assessment shall set out the results of the assessment, including -

(a) a statement that the assessment has established -

(b) a description of the methods used to carry out the assessment.

(3) Where the National Assembly for Wales considers that the assessment that is the subject of a report submitted to it in accordance with paragraph (1) has not been carried out satisfactorily, the National Assembly for Wales shall serve a notice on the water undertaker which -

(a) sets out the National Assembly for Wales' reasons for considering that the assessment has not been carried out satisfactorily; and

(b) requires the water undertaker, by a date specified in the notice, to carry out a further risk assessment and submit to the National Assembly for Wales a report of that assessment,

and the water undertaker shall comply with the requirement by the date specified.

(4) Where -

(a) a report submitted to the National Assembly for Wales in accordance with paragraph (1) includes a statement that the assessment has established that there is no significant risk from cryptosporidium; and

(b) the National Assembly for Wales is satisfied, on the basis of the report, that the risk assessment has been carried out satisfactorily,

the National Assembly for Wales shall notify the water undertaker that it is so satisfied; and if at the time of the submission of the report the water undertaker was, or was treated as, required to comply with regulation 29 requirements, the water undertaker shall cease to be required to comply with them from the date on which it receives the notification.

(5) Where -

(a) a report is submitted to the National Assembly for Wales in accordance with paragraph (1);

(b) the report includes a statement that the assessment has established that there is a significant risk from cryptosporidium; and

(c) the National Assembly for Wales is satisfied, on the basis of the report, that the risk assessment has been carried out satisfactorily,

the National Assembly for Wales shall notify the water undertaker that it is so satisfied and shall require the water undertaker to provide it with an estimate of the earliest practicable date by which it can comply with regulation 29 requirements.

    (6) A water undertaker which has received a notice under paragraph (5) shall provide the estimate required by the notice within three months of the receipt of the notice.

    (7) Where the National Assembly for Wales receives an estimate pursuant to a notice under paragraph (6) it shall give the water undertaker notice of the date which it considers to be the earliest practicable date by which the water undertaker can comply with regulation 29 requirements; and the water undertaker shall comply with those requirements from that date.

    (8) Where a water undertaker is required to comply with regulation 29 requirements at a treatment works, it may at any time carry out a further risk assessment for that treatment works to establish whether there continues to be a significant risk from cryptosporidium.

    (9) A water undertaker shall not supply water for regulation 4(1) purposes from any treatment works on or after 1st January 2002 unless -

(a) it has received a notice under regulation 23A(9) of the 1989 Regulations or paragraph (4) above in respect of that works; or

(b) where, pursuant to a notice given under paragraph (7) above, or regulation 23A(7) of the 1989 Regulations, it is required to comply with regulation 29 requirements or, in accordance with regulation 29(1), is treated as subject to those requirements, it is taking steps to comply with those requirements.

Treatment for cryptosporidium
     29. - (1) A water undertaker which, immediately before 1st January 2002, is subject to a requirement under regulation 23A of the 1989 Regulations to comply with the requirements of regulation 23B of those Regulations shall, for the purposes of the following provisions of this regulation and of regulation 28 of these Regulations, be treated on and after 1st January 2002 as subject to a requirement under regulation 28 to comply with regulation 29 requirements.

    (2) A water undertaker which is, or is treated as, required under regulation 28 to comply with regulation 29 requirements shall, in carrying out such of its functions under Part III of the Act as relate to the supply of water for regulation 4(1) purposes, use a process for treating the water intended to be supplied which secures that the average number of cryptosporidium oocysts per 10 litres of water is less than one.

    (3) For the purposes of paragraph (2), a process secures that the average number of cryptosporidium oocysts per 10 litres of water is less than one only if -

(a) the water is sampled, and collection devices are analysed, in accordance with the following provisions of this regulation; and

(b) each collection device, when analysed under paragraph (12) or (13), indicates that the water sampled has been treated so as to secure that the average number of cryptosporidium oocysts per 10 litres of water is less than one.

    (4) A water undertaker which is, or is treated as, required under regulation 28 to comply with regulation 29 requirements shall, in using the process referred to in paragraph (2), monitor its effectiveness by securing compliance with the requirements of paragraphs (5) to (15).

    (5) Subject to paragraph (6), a continuous sample of water, consisting of at least 40 litres per hour on average during each sampling period, shall be taken from each point at which water leaves the treatment works and steps shall be taken to ensure that the sample is not contaminated when being taken.

    (6) Where water which is subjected to the same treatment at the same treatment facilities before it leaves a treatment works leaves the works from more than one point, paragraph (5) shall require a continuous sample to be taken at only one of those points.

    (7) For the purposes of the requirement in paragraph (5) to take a continuous sample of water, no account shall be taken of -

(a) an interruption in the taking of the sample of less than one hour due to the changing of a collection device in accordance with paragraph (9); or

(b) an interruption in the taking of the sample during a period when water is not being supplied from the monitoring point.

    (8) A sample of water taken pursuant to paragraph (5) shall, as it is taken and without any further treatment, be passed through an approved collection device contained in approved sampling equipment which records the volume of water sampled.

    (9) Subject to paragraph (10), a water undertaker shall change the collection device through which water is being passed in accordance with paragraph (8) at least once a day by removing it in an approved manner from the relevant sampling equipment and replacing it in an approved manner with a clean collection device; and a record shall be made of the volume of water passed through the collection device which has been removed and that record shall be retained for a period of one year or such longer period as the National Assembly for Wales may, by notice in writing to the water undertaker, require.

    (10) Where, due to interruptions in the taking of a sample during periods when water is not being supplied from a monitoring point, the rate of water passed through a collection device is less than 200 litres per day, a water undertaker shall not be required to change the collection device in accordance with paragraph (9) until the day on which the total volume of water that has passed through the device equals or exceeds 200 litres.

    (11) A collection device removed from sampling equipment shall, prior to being analysed, be maintained in an approved manner so as to secure that there is no material alteration of the state of the device which could affect the results of the analysis.

    (12) A collection device shall, subject to paragraph (13), within three days of the date on which it is removed from the sampling equipment be analysed for the purposes of establishing whether it contains cryptosporidium oocysts at a level which indicates that the water sampled has not been treated so as to secure that the average number of cryptosporidium oocysts per 10 litres of water is less than one.

    (13) Where -

(a) there is a significant increase in the turbidity of water being sampled for the purpose of this regulation; or

(b) some other indication that the number of cryptosporidium oocysts in the water may have increased,

a water undertaker shall immediately change the collection device through which the water is being passed, and the removed collection device shall be analysed as soon as practicable and in any case not later than the end of the day after that on which it was removed.

    (14) The analysis of collection devices for the purposes of this regulation shall be carried out at an approved laboratory using approved equipment and approved analytical systems and methods.

    (15) Following the analysis of a collection device for the purposes of this regulation, the person by whom or under whose supervision the analysis has been carried out shall, within the applicable time limit for the analysis set out in paragraph (12) or (13), certify the results of the analysis, setting out the average number of cryptosporidium oocysts per 10 litres of water contained in the water sampled, as indicated by the level of cryptosporidium oocysts contained in the collection device.

    (16) In this regulation -

"approved" means approved by the National Assembly for Wales for the purpose of this regulation; and

"day" means the period of 24 hours commencing immediately after midnight.

Contamination from pipes
30. - (1) Where there is a risk ("the prescribed risk") that water supplied by a water undertaker would, for the reason mentioned in paragraph (2), after leaving the water undertaker's pipes -

(a) contain a concentration of copper in excess of 2mg/litre; or

(b) contain a concentration of lead in excess of 10µg/litre,

the water undertaker shall, subject to paragraph (3), treat the water in such a way as will, in its opinion, eliminate the prescribed risk or reduce it to a minimum.

(2) The reason referred to in paragraph (1) is the presence in the water of a concentration of copper or lead which is attributable to the fact that copper or lead is the major component of such a pipe as is mentioned in section 68(3)(a) of the Act, or its associated fittings.

(3) Paragraph (1) shall not require a water undertaker to treat water -

(a) if the treatment is unlikely to achieve a significant reduction in the concentration of copper or lead; or

(b) if treatment is not reasonably practicable.

(4) Where at any time in the period beginning with 25th December 2003 and ending immediately before 25th December 2013, a water undertaker -

(a) has reason to believe that water supplied by it for regulation 4(1) purposes from a pipe to which paragraph (5) applies contains, at the consumer's tap, a concentration of lead which exceeds 10µg/1 but does not exceed 25µg/1; and

(b) has received from the owner of premises to which water is so supplied notice in writing -

the water undertaker shall modify or replace its part of the pipe.

(5) This paragraph applies to a pipe -

(a) of which the major component is lead;

(b) which is subject to water pressure from a water main or would be so subject but for the closing of some valve; and

(c) which belongs, as to part, to a water undertaker and, as to the remainder, to the owner of any premises to which the water undertaker supplies water for regulation 4(1) purposes.

Application and introduction of substances and products
31. - (1) In this regulation -

"the Directive" means Council Directive 89/106/EEC on the approximation of laws, regulations and administrative provisions of the Member States relating to construction products[

"European technical approval" means a favourable technical assessment of the fitness for use of a construction product for an intended use, issued for the purposes of the Directive by a body authorised by an EEA State to issue European technical approvals for those purposes and notified by that body to the European Commission; and

"harmonized standard" means a standard established as mentioned in the Directive by the European standards organisation on the basis of a mandate given by the European Commission and published by the Commission in the Official Journal of the European Communities.

(2) Subject to paragraph (3), a water undertaker shall not apply any substance or product to, or introduce any substance or product into, water which is to be supplied for regulation 4(1) purposes unless one of the requirements of paragraph (4) is satisfied.

(3) A substance or product which, at the time of its application or introduction, bears an appropriate CE marking in accordance with the Directive, or conforms to -

may be applied or introduced, notwithstanding that none of the requirements of paragraph (4) is satisfied; but any such application or introduction shall be subject to -

(4) The requirements of this paragraph are -

    (5) An application for such an approval as is mentioned in paragraph (4)(a) may be made by any person.

    (6) If the National Assembly for Wales decides to issue an approval under paragraph (4)(a), it may include in the approval such conditions as it considers appropriate and, subject to paragraph (10), may at any time revoke or vary any approval it has previously given.

    (7) Where substances or products are applied or introduced in any case in which the requirement mentioned in paragraph (4)(c) is satisfied, their application or introduction shall be discontinued within 12 months of the date on which they were first applied or introduced or, if the National Assembly for Wales by notice given in writing to the water undertaker so directs, within such other period (whether longer or shorter) as may be specified in the notice.

    (8) The National Assembly for Wales may, by notice given in writing to any water undertaker, prohibit the water undertaker from applying to, or introducing into, water intended to be supplied for regulation 4(1) purposes any substance or product which the water undertaker would otherwise be authorised to apply or introduce by virtue of -

(9) A prohibition under paragraph (8) may be without limitation as to time or for such period as is specified in the notice.

(10) The National Assembly for Wales may -

but, unless the National Assembly for Wales is satisfied that it is necessary to do so in the interests of public health without notice, shall not do any of those things without giving all such persons as are, in the opinion of the National Assembly for Wales, likely to be affected by the revocation or modification of the approval or by the giving of the notice at least 6 months' notice in writing of its intention.

(11) Notice shall be given forthwith by the National Assembly for Wales to all persons likely to be affected by the making of such an instrument as is mentioned in paragraph (10)(a) or (b).

(12) At least once in each year beginning with the year 2004, the National Assembly for Wales shall issue a list of all the substances and products in relation to which -

with particulars of the action taken.

Use of processes
     32. - (1) The National Assembly for Wales may at any time by notice in writing given to a water undertaker require the water undertaker to make an application to it for approval of the use of any process; and may prohibit the water undertaker for such period as may be specified in the notice from using any such process in connection with the supply by the water undertaker of water for regulation 4(1) purposes.

    (2) The National Assembly for Wales may refuse the application or impose on any approval given for the purposes of this regulation such conditions as it thinks fit and, subject to paragraph (3), may at any time by notice in writing to the water undertaker revoke an approval so given or modify or revoke any condition imposed by virtue of this paragraph.

    (3) Subject to paragraph (4), the National Assembly for Wales shall not -

(a) revoke any approval given for the purposes of this regulation;

(b) modify any condition imposed by virtue of paragraph (2); or

(c) prohibit a water undertaker from using any process,

unless the National Assembly for Wales has given to the water undertaker at least 6 months' notice in writing of the National Assembly for Wales' intention to revoke, modify or prohibit, as the case may be.

(4) Paragraph (3) shall not apply in any case in which the National Assembly for Wales is of the opinion that the immediate revocation, modification or prohibition is necessary in the interests of public health.

(5) Paragraph (12) of regulation 31 shall apply for the purposes of this regulation as if -

(a) for the reference to a substance or product there were substituted a reference to a process; and

(b) for the reference to paragraph (4)(a) and paragraph (8) there were substituted a reference to this regulation and paragraph (1) of this regulation respectively.

Offences
33. - (1) A water undertaker which contravenes regulation 28(9) or regulation 29(2) or (4) shall be guilty of an offence and liable -

(a) on summary conviction, to a fine not exceeding the statutory maximum;

(b) on conviction on indictment, to a fine.

(2) In any proceedings under paragraph (1) above for contravention of regulation 29(2), a copy of a certificate given pursuant to paragraph (15) of that regulation shall be admissible in evidence as to the number of cryptosporidium oocysts per 10 litres of water.

(3) A water undertaker which applies or introduces any substance or product in contravention of regulation 31(2) or a notice given under regulation 31(8), or uses any process in contravention of a prohibition imposed under regulation 32(1) or without complying with a condition imposed by virtue of regulation 32(2) shall be guilty of an offence and liable -

(a) on summary conviction, to a fine not exceeding the statutory maximum;

(b) on conviction on indictment, to a fine.

(4) In any proceedings against a water undertaker for an offence under paragraph (1) above it shall be a defence for that water undertaker to show that it took all reasonable steps and exercised all due diligence to avoid the commission of the offence.

(5) If any person, in certifying the results of an analysis pursuant to regulation 29(15) or furnishing any information or making any application under regulation 31 or 32, makes any statement which he or she knows to be false in a material particular, or recklessly makes any statement which is false in a material particular, he or she shall be guilty of an offence and liable -

(a) on summary conviction, to a fine not exceeding the statutory maximum;

(b) on conviction on indictment, to a fine.

(6) Proceedings for an offence under paragraph (5) shall not be instituted except by or with the consent of the National Assembly for Wales or the Director of Public Prosecutions.

PART VIII
RECORDS AND INFORMATION
Maintenance of records
34. - (1) A water undertaker shall prepare and maintain, in respect of each of its water supply zones, a record containing -

(f) particulars of the result of any analysis of samples taken in accordance with Part IV of these Regulations or any of regulations 12 to 14 and 29; and

(g) such other particulars as the water undertaker may determine.

(2) A water undertaker shall make -

(3) Without prejudice to paragraph (2), the water undertaker shall at least once in each year review and bring up to date the record required to be kept by paragraph (1).

(4) Nothing in this regulation shall require a water undertaker to retain a record -

Provision of information
35. - (1) A water undertaker shall make available for inspection by the public at all reasonable hours and free of charge at least one of its offices any record maintained by it in accordance with regulation 34.

(2) A water undertaker shall afford to any person facilities to take or obtain a copy of any part of a record maintained in accordance with regulation 34 -

(a) in the case of information relating to that zone, free of charge if the person receives a supply of water in the zone;

(b) in any other case, on payment of such reasonable charge as the water undertaker may determine.

(3) A water undertaker shall include in or append to at least one of the accounts sent to each customer in any year a statement informing them -

(a) that records of water quality may be inspected by the public free of charge; and

(b) of the address, telephone number and hours of opening of the offices at which an inspection can be made.

(4) A water undertaker shall, not later than 30th June 2005 and not later than 30th June in each year thereafter, supply to each local authority to any part of whose area the water undertaker supplied water in the preceding year, information concerning the general quality of water supplied during that year to premises in the authority's area, and -

(a) in respect of each treatment works from which water was so supplied, the particulars referred to in paragraph (5);

(b) in respect of each service reservoir, and every other supply point (other than a treatment works), from which water was so supplied, the particulars referred to in paragraph (6);

(c) in respect of -

the particulars referred to in paragraph (7); and

(d) information as to the action taken by the water undertaker in that year to comply with -

(5) The particulars referred to in this paragraph are -

(a) the names of the water supply zones supplied from the works during the preceding year;

(b) the result of any analysis of samples taken in the preceding year in accordance with Part IV of these Regulations or any of regulations 12, 13 and 29;

(c) in relation to those samples and each parameter other than an indicator parameter -

(d) in respect of each indicator parameter, the number and percentage of the samples taken in the preceding year which did not meet the specification for that parameter;

(e) in respect of cryptosporidium and, with the exception of E.coli, coliform bacteria and every indicator parameter, each parameter, the minimum, mean and maximum concentrations; and

(f) in respect of residual disinfectant and, with the exception of clostridium perfringens (including spores), each indicator parameter, the minimum, mean and maximum concentrations or values or, where a state is specified in relation to any such parameter, a commentary on its state.

(6) The particulars referred to in this paragraph are -

(a) the names of the water supply zones supplied from the service reservoir or, as the case may be, the supply point, during the preceding year;

(b) the result of any analysis of samples taken in the preceding year in accordance with Part IV of these Regulations, regulation 12 or regulation 14;

(c) in relation to those samples and each parameter other than an indicator parameter -

(d) in respect of each indicator parameter, the number and percentage of the samples taken in the preceding year which did not meet the specification for that parameter;

(e) in respect of each parameter, with the exception of E.coli, coliform bacteria and every indicator parameter, the minimum, mean and maximum concentrations; and

(f) in respect of residual disinfectant and, with the exception of clostridium perfringens (including spores), each indicator parameter, the minimum, mean and maximum concentrations or values or, where a state is specified in relation to any such parameter, a commentary on its state.

(7) The particulars referred to in this paragraph are -

(a) the number of samples taken in the preceding year;

(b) the result of any analysis of samples taken in the preceding year in accordance with Part IV of these Regulations;

(c) in relation to those samples and each parameter other than an indicator parameter -

(d) in respect of each indicator parameter, the number and percentage of the samples taken in the preceding year which did not meet the specification for that parameter;

(e) in respect of each parameter, with the exception of E.coli, enterococci, and every indicator parameter, the minimum, mean and maximum concentrations; and

(f) in respect of residual disinfectant and, with the exception of coliform bacteria and clostridium perfringens (including spores), each indicator parameter, the minimum, mean and maximum concentrations or values or, where a state is specified in relation to any such parameter, a commentary on its state.

    (8) As soon as may be after the occurrence of any event which, by reason of its effect or likely effect on the water supplied by a water undertaker, gives rise or is likely to give rise to a significant risk to the health of persons residing in the area of a local authority or a health authority, the water undertaker shall notify each such authority and the relevant customer services committee of the occurence.

    (9) A water undertaker shall send to the National Assembly for Wales a copy of every notification given under paragraph (8).

    (10) Where an authority have received a notification under paragraph (8), they may require the water undertaker to provide them with such information relating to the event and its consequences as they may reasonably require.

Publication of information
     36. - (1) A water undertaker shall, not later than 30th June 2005 and not later than 30th June in each year thereafter, publish a report relating to the preceding year containing -

(a) a statement of the number of treatment works, service reservoirs and other supply points from which it supplied water during any part of the year;

(b) a statement of the number of its water supply zones for the year;

(c) in respect of water supplied from its treatment works, the particulars referred to in paragraph (4);

(d) in respect of its service reservoirs and other supply points (other than treatment works), the particulars referred to in paragraph (5);

(e) in respect of its water supply zones, the particulars referred to in paragraph (6);

(f) a statement of the action taken by the water undertaker during the year to comply with -

(g) a statement that any person may, free of charge, inspect the records of water quality kept by the water undertaker in accordance with regulation 34; and

(h) particulars of the times and places at which such inspection may be made.

    (2) A report under paragraph (1) may include such other information as the water undertaker thinks fit.

    (3) At the same time as it publishes a report in accordance with paragraph (1) the water undertaker shall send a copy of it to every local authority within whose area the water undertaker supplied water in the preceding year.

    (4) The particulars referred to in this paragraph are -

(a) the total number of samples taken from all of the water undertaker's treatment works in the preceding year in respect of cryptosporidium, residual disinfectant and each parameter;

(b) in relation to those samples and each parameter other than an indicator parameter -

(c) the number and percentage of treatment works at which samples of the descriptions mentioned in paragraphs (i) and (ii) of sub-paragraph (b) were produced;

(d) in relation to the samples mentioned in sub-paragraph (a) and each indicator parameter, the number and percentage of the samples which did not meet the specification for that parameter; and

(e) the number and percentage of treatment works at which samples of the description mentioned in sub-paragraph (d) were produced.

(5) The particulars referred to in this paragraph are -

(a) the total number of samples taken from all of the water undertaker's service reservoirs and other supply points (other than treatment works), in the preceding year in respect of residual disinfectant and each parameter;

(b) in relation to those samples -

(c) the number and percentage of service reservoirs, and other supply points (other than treatment works), at which samples of the descriptions mentioned in paragraphs (i) and (ii) of sub-paragraph (b) were produced;

(d) in relation to the samples mentioned in sub-paragraph (a) and each indicator parameter, the number and percentage of the samples which did not meet the specification for that parameter; and

(e) the number and percentage of service reservoirs, and other supply points (other than treatment works), at which samples of the description mentioned in sub-paragraph (d) were produced.

(6) The particulars referred to in this paragraph are -

(a) the total number of samples taken from all of the water undertaker's water supply zones in the preceding year in respect of residual disinfectant and each parameter;

(b) in relation to those samples and each parameter other than an indicator parameter -

(c) the number and percentage of water supply zones at which samples of the descriptions mentioned in paragraphs (i) and (ii) of sub-paragraph (b) were produced;

(d) in relation to the samples mentioned in sub-paragraph (a) and each indicator parameter, the number and percentage of the samples which did not meet the specification for that parameter; and

(e) the number and percentage of water supply zones at which samples of the description mentioned in sub-paragraph (d) were produced.

PART IX
FUNCTIONS OF LOCAL AUTHORITIES IN RELATION TO WATER QUALITY
Application and interpretation
     37. - (1) This Part applies to the performance by a local authority of their duty under section 77(1) of the Act[17] insofar as that duty relates to water supplies which are not private supplies.

    (2) In this Part "relevant water undertaker", in relation to a local authority, means a water undertaker any of whose supply zones include an area which is situated within the area of that authority.

Duties of local authorities: supplementary provision
     38. - (1) In performing their duty under section 77(1) of the Act (general functions of local authorities in relation to water quality), a local authority -

(2) Regulation 16 shall apply to samples taken by virtue of paragraph (1) as it applies to samples taken for the purposes of Parts IV and V of these Regulations; but with the following modifications -

PART X
ENFORCEMENT
Contraventions by water undertakers
     39. Any duty or requirement imposed by Parts IV to VIII of these Regulations on a water undertaker shall be enforceable under section 18 of the Act by the National Assembly for Wales or the Director, whether or not the duty or requirement constitutes an offence.

PART XI
AMENDMENT AND REVOCATION OF REGULATIONS AND SAVING AND TRANSITIONAL PROVISION
Amendment of the Water Supply (Water Quality) Regulations 1989
     40. The 1989 Regulations shall be amended, with effect from 1st January 2002, in accordance with Schedule 5.

Transitional provision: programmes of work
     41. - (1) Every water undertaker which intends to supply water, on and after 25th December 2003, for regulation 4(1) purposes shall, not later than 31st March 2002, submit to the National Assembly for Wales for its approval a programme of work designed to secure, so far as reasonably practicable -

and that, accordingly, section 68 (duties of water undertakers with respect to water quality) of the Act is complied with.

    (2) Programmes of work shall be drawn up in accordance with the provisions of Schedule 6.

    (3) The National Assembly for Wales may approve a programme of work with or without modification.

    (4) If a water undertaker -

the National Assembly for Wales may draw up a programme of work and any such programme shall be treated for the purposes of paragraphs (5) and (6) as a programme of work drawn up by the water undertaker and approved by the National Assembly for Wales.

    (5) Whenever it comes to the attention of a water undertaker that the steps to be taken in accordance with a programme of work submitted to, or approved by, the National Assembly for Wales, or treated as so approved, are insufficient to secure that the requirements of paragraph (1)(a) and (b) are met, it shall notify the National Assembly for Wales of the additional steps to be taken to secure that those requirements are met.

    (6) The National Assembly for Wales may at any time, and whether or not on the application of a water undertaker, modify any programme of work where it is of the opinion that such modification is required to secure that the requirements of paragraph (1)(a) and (b) are met.

    (7) It shall be the duty of each water undertaker -

(8) The duties imposed by paragraph (7) shall be enforceable under section 18 of the Act by the National Assembly for Wales.

Transitional provision: authorisations
42. - (1) A water undertaker which -

(a) intends to supply water, on and after 25th December 2003, for regulation 4(1) purposes; and

(b) has reason to believe that water so supplied will not satisfy the requirements of Part III of these Regulations,

may apply to the National Assembly for Wales for an authorisation under this regulation.

(2) An application under paragraph (1) shall be made not later than 25th September 2003.

(3) For the purpose of making and determining applications under paragraph (1) and publicising authorisations under this regulation, it shall be assumed -

(a) that regulations 4 and 20 to 23 of these Regulations,

and so much of any other provision of these Regulations as relates to those regulations (in so far as not already in force), were in force at the material time; and

(b) that references in any provision specified or referred to in sub-paragraph (a) to an authorisation under regulation 20 (in whatever terms) were references to an authorisation under this regulation.

(4) On and after 25th December 2003, an authorisation under this regulation shall have effect for the purposes of these Regulations as an authorisation under regulation 20.

Revocation of Regulations and savings
43. - (1) The Water Supply (Water Quality) (Amendment) Regulations 1999[18] and the following provisions of the 1989 Regulations shall be revoked -

(2) On 25th December 2003 -

shall be revoked.

(3) On 1st January 2004 -

shall be revoked.

(4) Nothing in paragraph (3) revokes any of the provisions referred to in that paragraph so far as they relate to local authorities in England.

(5) Nothing in paragraph (3) shall affect any obligation of a water undertaker under the 1989 Regulations to compile and retain records, make information available and produce reports in respect of years ending on or before 31st December 2003.

Signed on behalf of the National Assembly for Wales under section 66(1) of the Government of Wales Act 1998[23].

Rhodri Morgan
First Secretary

7th December 2001

SCHEDULE 1regulations 2 and 4

PRESCRIBED CONCENTRATIONS AND VALUES

TABLE A
MICROBIOLOGICAL PARAMETERS

Part I: Directive requirements

Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1.	Enterococci	0	number/100ml	Consumers' taps
2.	Escherichia coli (E. coli)	0	number/100ml	Consumers' taps

Part II: National requirements

Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1.	Coliform bacteria	0	number/100ml	Service reservoirs* and water treatment works
2.	Escherichia coli (E. coli)	0	number/100ml	Service reservoirs and water treatment works

Note: *Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).

TABLE B
CHEMICAL PARAMETERS

Part I: Directive requirements

Item	Parameters	Concentration or Value (maximum)	Units of Measurement	Point of compliance
1.	Acrylamide	0.10	µg/l	(i)
2.	Antimony	5.0	µgSb/l	Consumers' taps
3.	Arsenic	10	µgAs/l	Consumers' taps
4.	Benzene	1.0	µg/l	Consumers' taps
5.	Benzo(a)pyrene	0.010	µg/l	Consumers' taps
6.	Boron	1.0	mgB/l	Consumers' taps
7.	Bromate	10	µgBrO₃/l	Consumers' taps
8.	Cadmium	5.0	µgCd/l	Consumers' taps
9.	Chromium	50	µgCr/l	Consumers' taps
10.	Copper(i)	2.0	mgCu/l	Consumers' taps
11.	Cyanide	50	µgCN/l	Consumers' taps
12.	1, 2 dichloroethane	3.0	µg/l	Consumers' taps
13.	Epichlorohydrin	0.10	µg/l	(i)
14.	Fluoride	1.5	mgF/l	Consumers' taps
15.	Lead(ii)	(a) 25, from 25th December 2003 until immediately before 25th December 2013	µgPb/l	Consumers' taps
		(b) 10, on and after 25th December 2013	µgPb/l	Consumers' taps
16.	Mercury	1.0	µgHg/l	Consumers' taps
17.	Nickel (ii)	20	µgNi/l	Consumers' taps
18.	Nitrate (iii)	50	mgNO₃/l	Consumers' taps
19.	Nitrite (iii)	0.50	mgNO₂/l	Consumers' taps
		0.10		Treatment Works
20.	Pesticides (iv)(v) Aldrin ) Dieldrin ) Heptachlor ) Heptachlor ) epoxide )	0.030	µg/l	Consumers' taps
	other pesticides	0.10	µg/l	Consumers' taps
21.	Pesticides: Total (vi)	0.50	µg/l	Consumers' taps
22.	Polycyclic aromatic hydrocarbons (vii)	0.10	µg/l	Consumers' taps
23.	Selenium	10	µgSe/l	Consumers' taps
24.	Tetrachloroethene and Trichloroethene (viii)	10	µg/l	Consumers' taps
25.	Trihalomethanes: Total (ix)	100	µg/l	Consumers' taps
26.	Vinyl chloride	0.50	µg/l	(i)

Notes:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

(viii)

(xi)

The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

Part II: National requirements

Item Parameters Concentration or Value (maximum unless otherwise stated) Units of Measurement Point of compliance

1. Aluminium 200 µgAl/l Consumers' taps

2. Colour 20 mg/l Pt/Co Consumers' taps

3. Hydrogen ion 10.0 pH value Consumers' taps

6.5 (minimum) pH value Consumers' taps

4. Iron 200 µgFe/l Consumers' taps

5. Manganese 50 µgMn/l Consumers' taps

6. Odour 3 at 25°C Dilution number Consumers' taps

7. Sodium 200 mgNa/l Consumers' taps

8. Taste 3 at 25°C Dilution number Consumers' taps

9. Tetrachlorome-thane 3 µg/l Consumers' taps

10. Turbidity 4 NTU Consumers' taps

SCHEDULE 2regulations 2 and 4

INDICATOR PARAMETERS

Item	Parameters	Specification Concentration or Value (maximum) or State	Units of Measurement	Point of monitoring
1.	Ammonium	0.50	mgNH₄/l	Consumers' taps
2.	Chloride (i)	250	mgCl/l	Supply point*
3.	Clostridium perfringens (including spores)	0	Number/100ml	Supply point*
4.	Coliform bacteria	0	Number/100ml	Consumers' taps
5.	Colony counts	No abnormal change	Number/1ml at 22°C	Consumers' taps, service
			Number/1ml at 37°C	Reservoirs and treatment works
6.	Conductivity (i)	2500	µS/cm at 20°C	Supply point*
7.	Hydrogen ion	9.5	pHvalue	Consumers' taps
8.	Sulphate (i)	250	mgSO₄ /l	Supply point*
9.	Total indicative dose (for radioactivity) (ii)	0.10	mSv/year	Supply point*
10.	Total organic carbon (TOC)	No abnormal change	mgC/l	Supply point*
11.	Tritium (for radioactivity)	100	Bq/l	Supply point*
12.	Turbidity	1	NTU	Treatment works

Notes:

(i)

(ii)

*May be monitored from samples of water leaving treatment works or other supply point, as no significant change during distribution.

SCHEDULE 3Part IV

MONITORING

TABLE 1
PARAMETERS AND CIRCUMSTANCES FOR CHECK MONITORING

(1)	(2)	(3)
Item	Parameter	Circumstances
1.	Aluminium	When used as flocculant or where the water originates from, or is influenced by, surface waters
2.	Ammonium
3.	Clostridium perfringens (including spores)	Where the water originates from, or is influenced by, surface waters
4.	Coliform bacteria
5.	Colony counts
6.	Colour
7.	Conductivity
8.	Escherichia coli (E. coli)
9.	Hydrogen ion
10.	Iron	When used as flocculant or where the water originates from, or is influenced by, surface waters
11.	Manganese	Where the water originates from, or is influenced by, surface waters
12.	Nitrate	When chloramination is practised
13.	Nitrite	When chloramination is practised
14.	Odour
15.	Taste
16.	Turbidity

TABLE 2
ANNUAL SAMPLING FREQUENCIES: WATER SUPPLY ZONES

(1)	(2)	(3)	(4)
Substances and parameters subject to check monitoring	Estimated population of water supply zone	Reduced	Standard
E. coli
Coliform bacteria	<100		4
Residual disinfectant	≥100		12 per 5,000 population(i)
Aluminium
Ammonium
Clostridium perfringens (including spores)*	<100	1	2
	100 - 4,999	2	4
	5,000 - 9,999	6	12
Colony counts	10,000 - 29,999	12	24
Colour	30,000 - 49,999	18	36
Conductivity*	50,000 - 79,999	26	52
Hydrogen ion	80,000 - 100,000	38	76
Iron
Manganese
Nitrate(ii)
Nitrite(ii)
Odour
Taste
Turbidity
Parameters subject to audit monitoring
Aluminium
Antimony
Arsenic
Benzene*	<100		1
Benzo(a)pyrene	100 - 4,999		4
Boron*	5,000 - 100,000		8
Bromate(iii)
Cadmium
Chromium
Copper
Cyanide*
1,2 dichloroethane*
Enterococci
Fluoride*
Iron
Lead
Manganese
Mercury*
Nickel
Nitrate (ii)
Nitrite (ii)
Pesticides and related products*
Polycyclic aromatic	<100		1
hydrocarbons	100 - 4,999		4
Selenium	5,000 - 100,000		8
Sodium
Trichloroethene
/Tetrachloroethene*
Tetrachloromethane*
Trihalomethanes
Chloride*
Sulphate*
Total organic carbon*
Tritium*
Gross alpha* (iv)
Gross beta* (iv)

Notes: * Sampling for these parameters may be within water supply zones or at supply points as specified in Table 3, subject to notes (ii) and (iii) below.

(i)

(ii)

(iii)

(iv)

TABLE 3
ANNUAL SAMPLING FREQUENCIES: TREATMENT WORKS OR SUPPLY POINTS*

(1)	(2)	(3)	(4)	(5)
Item	Substances and parameters	Volume of water supplied m³/d	Reduced	Standard
1.	E. Coli	<20		4
2.	Coliform bacteria	20 - 1,999	12	52
3.	Colony counts	2,000 - 5,999	52	104
4.	Nitrite (ii)	6,000 - 11,999	104	208
5.	Residual disinfectant	≥12,000	104	365
6.	Turbidity
Subject to check monitoring
7.	Clostridium perfringens(i)	<20		2
		20 - 999	2	4
8.	Conductivity	1,000 - 1,999	6	12
		2,000 - 5,999	12	24
		6,000 - 9,999	18	36
		10,000 - 15,999	26	52
		16,000 - 32,999	52	104
		33,000 - 49,999	78	156
		50,000 - 67,999	104	208
		68,000 - 84,999	130	260
		85,000 - 101,999	156	312
		102,000 - 119,999	183	365
		120,000 - 241,999	365	730
		242,000 - 484,999	730	1,460
		485,000 - 728,999	1,095	2,190
Subject to audit monitoring
9.	Benzene
10.	Boron
11.	Bromate (iv)
12.	Cyanide
13.	1,2 dichloroethane
14.	Fluoride
15.	Mercury	<20		1
16.	Nitrite (iii)	20 - 999		4
17.	Pesticides and Related products	1,000 - 49,999	8
		50,000 - 89,999	12
		90,000 - 299,999	24
		300,000 - 649,000	36
18.	Trichloroethene ) Tetrachloroethene)	≥650,000	48
19.	Tetrachloromethane
20.	Chloride
21.	Sulphate
22.	Total organic carbon
23.	Tritium
24.	Gross alpha (v)
25.	Gross beta (v)

Notes: *Sampling is at treatment works for the substances and parameters shown in column (1) of the Table as items 1 to 6 and at supply points for the other substances and parameters, except nitrite, subject to notes (ii) and (iii) below.

(i)

(ii)

(iii)

(iv)

(v)

SCHEDULE 4regulation 16

ANALYTICAL METHODOLOGY

TABLE A1
PARAMETERS FOR WHICH, SUBJECT TO REGULATION 16(7), METHODS OF ANALYSIS ARE PRESCRIBED

(1)	(2)
Parameter	Method
Clostridium perfringens (including spores)	Membrane filtration followed by anaerobic incubation of the membrane on m-CP agar* at 44 ± 1°C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds.
Coliform bacteria	ISO 9308-1
Colony count 22°C - enumeration of culturable microorganisms	prEN ISO 6222
Colony count 37°C - enumeration of culturable microorganisms	prEN ISO 6222
Enterococci	ISO 7899-2
Escherichia coli (E. coli)	ISO 9308-1

*The composition of m-CP agar is:

Basal medium
Tryptose	30.0g
Yeast extract	20.0g
Sucrose	5.0g
L-cysteine hydrochloride	1.0g
MgSO₄·7H₂O	0.1g
Bromocresol purple	40.0mg
Agar	15.0g
Water	1,000.0ml

Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for15 minutes. Allow the medium to cool and add:

D-cycloserine	400.0mg
Polymyxine-B sulphate	25.0mg
Indoxyl-[beta]-D-glucoside	60.0mg
to be dissolved in 8ml sterile water before addition
Filter - sterilised 0.5% phenolphthalein diphosphate solution	20.0ml
Filter - sterilised 4.5% FeCl₃· 6H₂O	2.0ml

TABLE A2
PARAMETERS IN RELATION TO WHICH METHODS OF ANALYSIS MUST SATISFY PRESCRIBED CHARACTERISTICS

(1)	(2)	(3)	(4)
Parameters	Trueness % of prescribed concentration or value or specification	Precision % of prescribed concentration or value or specification	Limit of detection % of prescribed concentration or value or specification
Aluminium	10	10	10
Ammonium	10	10	10
Antimony	25	25	25
Arsenic	10	10	10
Benzene	25	25	25
Benzo(a)pyrene	25	25	25
Boron	10	10	10
Bromate	25	25	25
Cadmium	10	10	10
Chloride	10	10	10
Chromium	10	10	10
Colour	10	10	10
Conductivity	10	10	10
Copper	10	10	10
Cyanide(i)	10	10	10
1,2-dichloroethane	25	25	10
Fluoride	10	10	10
Iron	10	10	10
Lead	10	10	10
Manganese	10	10	10
Mercury	20	10	20
Nickel	10	10	10
Nitrate	10	10	10
Nitrite	10	10	10
Pesticides and related products(ii)	25	25	25
Polycyclic aromatic hydrocarbons(iii)	25	25	25
Selenium	10	10	10
Sodium	10	10	10
Sulphate	10	10	10
Tetrachloromethane	20	20	20
Trichloroethene(iv)	25	25	10
Trihalomethanes: Total(iii)	25	25	10
Turbidity(v)	10	10	10
Turbidity (vi)	25	25	25

Notes:

(i)

(ii)

(iii)

(iv)

(v)

(vi)

SCHEDULE 5regulation 40

AMENDMENT OF THE WATER SUPPLY (WATER QUALITY) REGULATIONS 1989

The amendments to the 1989 Regulations referred to in regulation 40 are -

Frequency of sampling for particular organisms and substances

13A.

the number of samples to be taken in any period of twelve months beginning with the date on which the programe was approved, treated as approved, or agreed (as the case may be) and ending on the day on which the last of those steps is completed, for analysis for testing for that organism or substance, may be the number shown in column (4) or, as the case may be, column (6) of that Table with the prefix "R".

(6) Where analysis of the samples taken by a water undertaker in 2002 in accordance with this regulation has established a concentration or value in respect of an organism or substance listed in column (1) of Table 4A that is significantly lower than the prescribed concentration or value, the number of samples to be taken in 2003, for analysis for testing for that organism or substance, may be the number shown in column (4) or, as the case may be, column (6) of that Table with the prefix "R".";

Additional testing for particular parameters

20A.

Method of analysis of samples for particular parameters, and substances

21A.

(2) For the purposes of paragraph (1) -

"limit of detection" is to be calculated as -

"precision" (the random error) is the standard deviation (within a batch and between batches) of the spread of results about the mean; and

"trueness" (the systematic error) is the difference between the mean value of a large number of repeated measurements and the true value.";

(f) the insertion, after Table 4 in Schedule 3, of the following Tables -

" TABLE 4A

SAMPLING FOR PARTICULAR ORGANISMS AND SUBSTANCES

(1)	(2)	(3)	(4)	(5)	(6)
Organism or substance	Concentration or value and unit of measurement	Volume of water supplied m³/d	Annual sampling frequency	Estimated population of water supply zone	Annual sampling frequency
Benzene	1.0µg/l
Bromate	1.0µgBrO₃/l
		≤999	S2 or R1	≤4,999	S2 or R1
Clostridium perfringens* (Including spores)	0	1,000 - 49,999	S4 or R1	5,000 - 50,000	S4 or R1
		≤50,000
	Number/ 100ml		S8 or R2
1,2 dichloroethane	3.0 µg/l
Enterococci	0 Number/100ml
Nitrite	0.10 mgNO₂/l

TABLE 4B

PARAMETERS AND SUBSTANCES IN RELATION TO WHICH, SUBJECT TO REGULATION 21A, METHODS OF ANALYSIS MUST SATISFY PRESCRIBED CHARACTERISTICS

(1)	(2)	(3)	(4)	(5)
Parameter or other substance	Concentration and unit of measurement	Trueness % of concentration	Precision % of concentration	Limit of detection % of concentration
Antimony	5.0 µgSb/l	25	25	25
Arsenic	10 µgAs/l	10	10	10
Benzene	1.0 µg/l	25	25	25
Boron	1.0 mgB/l	10	10	10
Bromate	10 µBrO₃/l	25	25	25
Copper	2.0 mgCu/l	10	10	10
1,2 dichloroethane	3.0 µg/l	25	25	10
Lead	25 µgPb/l	10	10	10
Nickel	20 µgNi/l	10	10	10
Nitrite (ex works)	0.1 gNO₂/l	10	10	10
Tetrachloroethene) Trichloroethene )	10 µg/l	25	25	10

SCHEDULE 6regulation 41

PROGRAMMES OF WORK

A water undertaker's programme of work shall -

₃

₂

TABLE
Enterococci

Acrylamide

Antimony

Arsenic

Benzene

Benzo(a)pyrene

Boron

Bromate

Copper

1,2-dichloroethane

Epichlorohydrin

Lead

Nickel

Nitrite

Polycyclic aromatic hydrocarbons

Tetrachloroethene ) sum of concentrations

Trichloroethene )

Trihalomethanes - Total (sum of concentrations of chloroform, bromoform, dibromochloromethane and bromodichloromethane)

Vinyl chloride

Notes:

[1] 1991 c.56. Section 213 is amended by the Competition and Service (Utilities) Act 1992 (c.43). Functions under section 67 of the Water Industry Act 1991 for making regulations concerning water supplied by water undertakers, and functions under section 69 of that Act were transferred to the National Assembly for Wales in relation to any water undertaker whose area is wholly or mainly in Wales by the National Assembly for Wales (Transfer of Functions) Order 1999 (S.I. 1999/672), Schedule 1, as substituted by S.I. 2000/253, Schedule 3. Functions under section 213 of the Water Industry Act 1991 are exercisable by the National Assembly for Wales to the same extent as the powers, duties and other provisions to which that section applies are exercisable by the Assembly; see S.I. 1999/672, Schedule 1, as substituted by S.I. 2000/253, Schedule 3.back

[2] Functions under section 77(3) and (4) of the Water Industry Act 1991 are transferred to the National Assembly for Wales, so far as exercisable in relation to Wales, by S.I. 1999/672, Schedule 1, as substituted by S.I. 2000/253, Schedule 3.back

[3] S.I. 1989/1147, amended by S.I. 1989/1384, 1991/1837, and 2790, 1996/3001 and 1999/1524.back

[4] 1991 c.57.back

[5] 1977 c.49. Section 8 was substituted by the Health Authorities Act 1995 (c.17), section 1.back

[6] See, as to the functions of customer services committees, section 29 of the Water Industry Act 1991.back

[7] O.J. L330, 5.12.98, p.32.back

[8] O.J. No. L194, 16.6.75, p.26.back

[9] 1991 c.57.back

[10] S.I. 1996/3001.back

[11] Regulations 23A and 23B were inserted by S.I. 1999/1524.back

[12] The date on which regulation 23A of the Water Supply (Water Quality) Regulations 1989 came into force.back

[13] O.J. No. L40, 11.2.89, p.12.back

[14] Cmnd 2073.back

[15] Cmnd 2183.back

[16] O.J. No. L204, 21.7.98, p.37, amended by Council Directive 98/48/EC (O.J. No. L217, 5.8.98, p.18).back

[17] As to the application of section 77(1) to the councils of counties in which there are no distinct councils see regulation 5(7) of S.I. 1994/867 as substituted by S.I. 1996/611.back

[18] S.I. 1999/1524.back

[19] S.I. 1989/1384.back

[20] S.I. 1991/1837.back

[21] S.I. 1991/2790, to which there are amendments not relevant to these Regulations.back

[22] S.I. 1996/3001.back

[23] 1998 c.38.back

ISBN 0 11 090431 1

Prepared 1 March 2002

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	Statutory Instruments made by the National Assembly for Wales
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Item	Parameters	Concentration or Value (maximum unless otherwise stated)	Units of Measurement	Point of compliance
1.	Aluminium	200	µgAl/l	Consumers' taps
2.	Colour	20	mg/l Pt/Co	Consumers' taps
3.	Hydrogen ion	10.0	pH value	Consumers' taps
		6.5 (minimum)	pH value	Consumers' taps
4.	Iron	200	µgFe/l	Consumers' taps
5.	Manganese	50	µgMn/l	Consumers' taps
6.	Odour	3 at 25°C	Dilution number	Consumers' taps
7.	Sodium	200	mgNa/l	Consumers' taps
8.	Taste	3 at 25°C	Dilution number	Consumers' taps
9.	Tetrachlorome-thane	3	µg/l	Consumers' taps
10.	Turbidity	4	NTU	Consumers' taps