Chwilio Deddfwriaeth

The Water Supply (Water Quality) Regulations 2010 (revoked)

 Help about what version

Pa Fersiwn

 Help about advanced features

Nodweddion Uwch

 Help about opening options

Dewisiadau AgorExpand opening options

Status:

Point in time view as at 11/04/2018.

Changes to legislation:

There are currently no known outstanding effects for the The Water Supply (Water Quality) Regulations 2010 (revoked). Help about Changes to Legislation

Regulations 2 and 4

SCHEDULE 1E+WPRESCRIBED CONCENTRATIONS AND VALUES

Table A

Microbiological Parameters

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

Part I: Directive requirements
ItemParametersConcentration or Value (maximum)Units of MeasurementPoint of compliance
1Enterococci0number/100 mlConsumers' taps
2Escherichia coli (E coli)0number/100 mlConsumers' taps
Part II: National requirements
ItemParametersConcentration or Value (maximum)Units of MeasurementPoint of compliance
1Coliform bacteria0number/100 mlService reservoirs1 and water treatment works
2Escherichia coli (E coli)0number/100 mlService reservoirs and water treatment works

Table B

Chemical Parameters

Notes:

1 The parametric value refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water. This is controlled by product specification.

2 See also regulation 6(6).

3 See also regulation 4(2)(d).

4 See the definition of “pesticides and related products” in regulation 2.

5 The parametric value applies to each individual pesticide.

6Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.

7 The specified compounds are:

  • — benzo(b)fluoranthene

  • — benzo(k)fluoranthene

  • — benzo(ghi)perylene

  • — indeno(1,2,3-cd)pyrene.

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

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

9 The specified compounds are:

  • — chloroform

  • — bromoform

  • — dibromochloromethane

  • — bromodichloromethane.

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

Part I: National requirements
ItemParametersConcentration or Value (maximum)Units of MeasurementPoint of compliance
1Acrylamide0.10μg/l1
2Antimony5.0μgSb/lConsumers' taps
3Arsenic10μgAs/lConsumers' taps
4Benzene1.0μg/lConsumers' taps
5Benzo(a)pyrene0.010μg/lConsumers' taps
6Boron1.0mgB/lConsumers' taps
7Bromate10μBrO3/lConsumers' taps
8Cadmium5.0μgCd/lConsumers' taps
9Chromium50μgCr/lConsumers' taps
10Copper 22.0mgCu/lConsumers' taps
11Cyanide50μgCN/lConsumers' taps
121, 2 dichloroethane3.0μg/lConsumers' taps
13Epichlorohydrin0.10μg/l1
14Fluoride1.5mgF/lConsumers' taps
15Lead 2

(a)25, from 25th December 2003 until immediately before 25th December 2013

μgPb/lConsumers' taps

(b)10, on and after 25th December 2013

μgPb/lConsumers' taps
16Mercury1.0μgHg/lConsumers' taps
17Nickel 220μgNi/lConsumers' taps
18Nitrate 350mgNO3/lConsumers' taps
19Nitrite 30.50mgNO2/lConsumers' taps
0.10Treatment Works
20Pesticides 45
Aldrin)0.030μg/lConsumer's taps
Dieldrin)
Heptachlor)
Heptachlor
epoxide)
other pesticides0.10μg/lConsumers' taps
21Pesticides: Total 60.50μg/lConsumers' taps
22Polycyclic aromatic hydrocarbons 70.10μg/lConsumers' taps
23Selenium10μgSe/lConsumers' taps
24Tetrachloroethene and Trichloroethene 810μg/lConsumers' taps
25Trihalomethanes: Total 9100μg/lConsumers' taps
26Vinyl chloride0.50μg/l1
Part II: National requirements
ItemParametersConcentration or Value (maximum unless otherwise stated)Units of MeasurementPoint of compliance
1Aluminium200μgAl/lConsumers' taps
2Colour20mg/l Pt/CoConsumers' taps
3Iron200μgFe/lConsumers' taps
4Manganese50μgMn/lConsumers' taps
5OdourAcceptable to consumers and no abnormal change....................Consumers' taps
6Sodium200mgNa/lConsumers' taps
7TasteAcceptable to consumers and no abnormal change....................Consumers' taps
8Tetrachlorome-thane3μg/lConsumers' taps
9Turbidity4NTUConsumers' taps

Regulations 2 and 4

SCHEDULE 2E+WINDICATOR PARAMETERS

Notes:

1 The water should not be aggressive.

2 F1. . .

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

ItemParametersSpecification Concentration or Value (maximum unless otherwise stated) or StateUnits of MeasurementPoint of compliance
1Ammonium0.50mgNH4/lConsumers' taps
2Chloride 1250mgCl/lSupply point3
3Clostridium perfringens (including spores)0Number/100 mlSupply point3
4Coliform bacteria0Number/100 mlConsumers' taps
5Colony countsNo abnormal changeNumber/1 ml at 22°CConsumers' taps, service
Number/1 ml at 37°CReservoirs and treatment works
6Conductivity 12500μS/cm at 20°CSupply point3
7Hydrogen ion9.5pHvalueConsumers' taps
6.5 (minimum)pH value
8Sulphate 1250mgSO4/lSupply point3
9F2. . .F2. . .F2. . .F2. . .
10Total organic carbon (TOC)No abnormal changemgC/lSupply point3
11F3. . .F3. . .F3. . .F3. . .
12Turbidity1NTUTreatment works

Textual Amendments

Regulation 6A

[F4SCHEDULE 2AE+WRadioactive substances parameters

Parametric values for radon, tritium and ID of water intended for human consumption

ParametersMaximum concentration or valueUnits of measurement
(i)

Enforcement action by the Welsh Ministers is deemed justified on radiological protection grounds without further consideration where radon concentrations exceed 1,000 Bq/1.

(ii)

If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides must be carried out.]

Indicative dose (for radioactivity)

0,10

mSv

Radon100Bq/1
Tritium (for radioactivity)100Bq/l

SCHEDULE 3E+WMONITORING

PART IV

Table 1 E+WParameters and Circumstances for Check Monitoring

(1)(2)(3)
ItemParameterCircumstances
1AluminiumWhen used as flocculant or where the water originates from, or is influenced by, surface waters
2Ammonium
3Clostridium perfringens (including spores)Where the water originates from, or is influenced by, surface waters
4Coliform bacteria
5Colony counts
6Colour
7Conductivity
8Escherichia coli (E coli)
9Hydrogen ion
10IronWhen used as flocculant or where the water originates from, or is influenced by, surface waters
11ManganeseWhere the water originates from, or is influenced by, surface waters
12NitrateWhen chloramination is practised
13NitriteWhen chloramination is practised
14Odour
15Taste
16Turbidity

Regulation 9

Table 2 E+WAnnual Sampling Frequencies: Water Supply Zones

Note: This table sets out the annual sampling frequencies for all the substances and parameters in column 1. These are determined for each water supply zone according to its estimated population (column 2). The number of samples is either the standard number in column 4 or the reduced number in column 3 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken.

1 Where the population is not an exact multiple of 5,000, the population figure should be rounded up to the nearest multiple of 5,000.

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

3 Check monitoring in water supply zones is required only where chloramination is practised. In other circumstances audit monitoring is required.

4 Audit monitoring in water supply zones is required only where sodium hypochlorite is added after water has left the treatment works. In other circumstances, audit monitoring is required at supply points.

5 F5...

(1)(2)(3)(4)
Substances and parameters subject to check monitoringEstimated population of water supply zoneReducedStandard
Subject to check monitoring
E coli<1004
Coliform bacteria≥10012 per 5,000 population1
Residual disinfectant
Aluminium

<100

100—4,999

5,000—9,999

10,000—29,999

30,000—49,999

50,000—79,999

80,000—100,000

1

2

6

12

18

26

38

2

4

12

24

36

52

76

Ammonium
Clostridium perfringens (including spores)2
Colony counts
Colour
Conductivity2
Hydrogen ion
Iron
Manganese
Nitrate 3
Nitrite 3
Odour
Taste
Turbidity
Subject to audit monitoring
Aluminium

<100

100—4,999

5,000—100,000

1

4

8

Antimony
Arsenic
Benzene2
Benzo(a)pyrene
Boron2
Bromate 4
Cadmium
Chromium
Clostridium perfringens (including spores)
Copper
Cyanide2
1,2 dichloroethane2
Enterococci
Fluoride2
Iron
Lead
Manganese
Mercury2
Nickel
Nitrate 3
Nitrite 3
Pesticides and related products 2
Polycyclic aromatic hydrocarbons
[F6Radon(b)]
Selenium
Sodium
Trichloroethene /Tetrachloroethene2
Tetrachloromethane2
Trihalomethanes
Chloride2
Sulphate2
Total organic carbon2
Tritium2
[F7Indicative dose (for radioactivity)(b)]

Regulation 9

Table 3 E+WAnnual Sampling Frequencies: Treatment Works or Supply Points

Note 1: 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 nitrate subject to footnotes (ii) and (ii)(a) to the Table below. Note 2: This table sets out the annual sampling frequencies for all the substances and parameters in column 2 at treatment works or supply points. The frequencies are determined according to the volume of water supplied at each treatment works or supply point (column 3). The number of samples is either the standard number in column 5 or the reduced number in column 4 (if one is given). Regulation 9 provides for the circumstances in which the reduced number of samples may be taken.

1 Sampling at treatment works when chloramination is practised.

2 Check monitoring is required only in respect of surface waters (see regulation 6(2) and Table 1 in Schedule 3).

3 Audit monitoring at supply points is required only where sodium hypochlorite is not added after water has left the treatment works. In other circumstances, audit monitoring is required in water supply zones.

4 Sampling at treatment works when chloramination is not practised.

5F8...

(1)(2)(3)(4)(5)
ItemSubstances and parametersVolume of water supplied m3/dReducedStandard
1.E Coli

<20

20—1,999

2,000—5,999

6,000—11,999

≥12,000

12

52

104

104

4

52

104

208

365

2.Calliform bacteria
3.Colony counts
4.Nitrite 1
5.Residual disinfectant
6.Turbidity
Subject to check monitoring
7.Clostridium perfringens2

<20

20—999

1,000—1,999

2,000—5,999

6,000—9,999

10,000—15,999

16,000—32,999

33,000—49,999

50,000—67,999

68,000—84,999

85,000—101,999

102,000—119,999

120,000—241,999

242,000—484,999

485,000—728,999

2

6

12

18

26

52

78

104

130

156

183

365

730

1,095

2

4

12

24

36

52

104

156

208

260

312

365

730

1,460

2,190

8.Conductivity
Subject to audit monitoring
9.Benzene

<20

20—999

1,000—49,999

50,000—89,999

90,000—299,999

300,000—649,000

≥650,000

1

4

8

12

24

36

48

10.Boron
11.Bromate 3
11A.Clostridium perfringens (including spores)
12.Cyanide
13.1,2 dichloroethane
14.Fluoride
15.Mercury
16.Nitrite 4
17.Pesticides and Related products
[F917A Radon]
18.Trichloroethene
Tetrachloroethene
19.Tetrachloromethane
20.Chloride
21.Sulphate
22.Total organic carbon
23.Tritium
24. [F10Indicative dose (for radioactivity)(b)
25.]

Regulation 6A

[F11SCHEDULE 3AE+WMonitoring of radioactive substances

RadonE+W

1.(1) In relation to the radon parameter in the radioactive substances parameters table, a water undertaker—

(a)must ensure that a representative survey is carried out in accordance with sub-paragraph (2) to determine the likelihood of a supply failing to comply with the relevant parametric concentration or value specified in the radioactive substances parameters table; and

(b)must carry out monitoring where there is reason to believe, on the basis of the results of the representative surveys or other reliable information, including any risk assessment carried out in accordance with regulation 28, that the parametric value for the radon parameter laid down in the radioactive substances parameters table might be exceeded.

(2) A representative survey must be designed in such a way—

(a)as to be capable of determining the scale and nature of likely exposure to radon in water intended for human consumption originating from different types of groundwater sources and wells in different geological areas; and

(b)that underlying parameters, especially the geology and hydrology of the area, radioactivity of rock or soil, and well type, can be identified and used to direct further action to areas of likely high exposure.

TritiumE+W

2.(1) In relation to the tritium parameter in the radioactive substances parameters table, a water undertaker—

(a)must carry out monitoring where an anthropogenic source of tritium or other artificial radionuclides is present within a water supply zone and it cannot be shown on the basis of other surveillance programmes or investigations, including any risk assessment carried out in accordance with regulation 28, that the level of tritium is below the parametric value listed in the radioactive substances parameters table; and

(b)must carry out an investigation of the presence of other artificial radionuclides if the concentration of tritium exceeds the parametric value listed in the radioactive substances parameters table.

(2) Where monitoring is required by sub-paragraph (1) samples must be taken in accordance with regulation 9(1) and (3).

Indicative DoseE+W

3.(1) In relation to the indicative dose (“ID”) parameter in the radioactive substances parameters table, a water undertaker must carry out monitoring where a source of artificial radioactivity or elevated natural radioactivity is present in a water supply zone and it cannot be shown on the basis of other surveillance programmes or investigations, including any risk assessment carried out in accordance with regulation 28, that the level of ID is below the parametric value listed the radioactive substances parameters table.

(2) Where monitoring is required by sub-paragraph (1) in relation to artificial radionuclides samples must be taken in accordance with regulation 9(1) and (3).

(3) Where monitoring is required by sub-paragraph (1) in relation to a source of elevated natural radioactivity—

(a)the Welsh Ministers must specify, by notice in writing to the water undertaker, the frequency of the monitoring required of—

(i)gross alpha activity;

(ii)gross beta activity; or

(iii)individual natural radionuclides,

depending on the screening strategy adopted by the water undertaker pursuant to Schedule 5; and

(b)the frequency of monitoring required under sub-paragraph (a) may vary from a single check measurement to the frequencies required for sampling in accordance with regulation 9(1).

(4) Where a single check for natural radioactivity is specified under paragraph (3)(a), the water undertaker must carry out a further check if any change occurs in relation to the supply which is likely to influence the concentrations of radionuclides in the supply.

Water treatmentE+W

4.  Where treatment to reduce the level of radionuclides in a water supply zone has been undertaken, to verify the continued efficacy of that treatment, the water undertaker must—

(a)monitor the supply for total indicative dose, radon and tritium in accordance the provisions of this Schedule; and

(b)take samples in accordance with regulation 9(1) and (3).

AveragingE+W

5.  Where a parametric value in the radioactive substances parameters table is exceeded in relation to a particular sample taken by a water undertaker, the Welsh Ministers must specify, by notice in writing to the water undertaker, the extent of resampling necessary to ensure that the measured values are representative of an average activity concentration for a full year.]

Regulation 16

SCHEDULE 4E+WANALYTICAL METHODOLOGY

Regulation 16

Table A1 E+WParameters for which, Subject to Regulation 16(7), Methods of Analysis are Prescribed

(1)(2)
ParameterMethod
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 bacteriaISO 9308-1
Colony count 22°C-enumeration of culturable microorganismsprEN ISO 6222
Colony count 37°C-enumeration of culturable microorganismsprEN ISO 6222
EnterococciISO 7899-2
Escherichia coli (E coli)ISO 9308-1
*The composition of m-CP agar is:
Basal medium
Tryptose30.0g
Yeast extract20.0g
Sucrose5.0g
L-cysteine hydrochloride1.0g
MgSO4·7H2O0.1g
Bromocresol purple40.0mg
Agar15.0g
Water1,000.0ml
Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool and add:
D-cycloserine400.0mg
Polymyxine-B sulphate25.0mg
Indoxyl-[beta]-D-glucoside to be dissolved in 8 ml sterile water before addition60.0mg
Filter-sterilised 0.5% phenolphthalein diphosphate solution20.0 ml
Filter-sterilised 4.5% FeCl3·6H2O2.0 ml

Table A2 E+WParameters for which, Subject to Regulation 16(7), Methods of Analysis are Prescribed

Notes:

1 The method of analysis should determine total cyanide in all forms.

2 The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.

3 The performance characteristics apply to the individual substances specified at 25% of the parametric value in Part I of Table B in Schedule 1.

4 The performance characteristics apply to the individual substances specified at 50% of the parametric value in Part I of Table B in Schedule 1.

5 The performance characteristics apply to the prescribed value of 4NTU.

6 The performance characteristics apply to the specification of 1NTU for water leaving treatment works.

(1)(2)(3)(4)
ParametersTrueness % of prescribed concentration or value or specificationPrecision % of prescribed concentration or value or specificationLimit of detection % of prescribed concentration or value or specification
Aluminium101010
Ammonium101010
Antimony252525
Arsenic101010
Benzene252525
Benzo(a)pyrene252525
Boron101010
Bromate252525
Cadmium101010
Chloride101010
Chromium101010
Colour101010
Conductivity101010
Copper101010
Cyanide 1101010
1,2-dichloroethane252510
Fluoride101010
Iron101010
Lead101010
Manganese101010
Mercury201020
Nickel101010
Nitrate101010
Nitrite101010
Pesticides and related products 2252525
Polycyclic aromatic hydrocarbons 3252525
Selenium101010
Sodium101010
Sulphate101010
Tetrachloromethane202020
Trichloroethene 4252510
Trihalomethanes: Total 3252510
Turbidity 5101010
Turbidity 6252525

Regulation 6A

[F12SCHEDULE 5E+WMonitoring for indicative dose and analytical performance characteristics

Monitoring for compliance with the indicative doseE+W

1.  A water undertaker may use reliable screening strategies to indicate the presence of radioactivity in water intended for human consumption.

2.  The strategies referred to in paragraph 1 may include screening for–

(a)certain radionuclides or individual radionuclide; or

(b)gross alpha activity or gross beta activity (where appropriate gross beta activity may be replaced by residual beta activity after subtraction of the K-40 activity concentration).

Screening for certain radionuclides, or screening for an individual radionuclideE+W

3.  If one of the activity concentrations exceeds 20% of the corresponding derived value or the tritium concentration exceeds its parametric value listed in Schedule 2A an analysis of additional radionuclides is required.

4.  A water undertaker must, in deciding which radionuclides require to be measured for each supply, take into account all relevant information about likely sources of radioactivity.

Screening strategies for gross alpha activity and gross beta activityE+W

5.  Subject to paragraph 6 the recommended screening values are–

(a)0,1Bq/l for gross alpha activity; and

(b)1,0Bq/l for gross beta activity.

6.  If the gross alpha activity exceeds 0,1Bq/l or the gross beta activity exceeds 1,0Bq/l, analysis for specific radionuclides is required.

7.  The Welsh Ministers may set alternative screening levels for gross alpha activity and gross beta activity where it can be demonstrated by the water undertaker that the alternative levels are in compliance with an indicative dose of 0,1 mSv.

8.  The radionuclides to be measured must be based on all relevant information about likely sources of radioactivity.

Calculation of the indicative doseE+W

9.  The indicative dose must be calculated from–

(a)the measured radionuclide concentrations and the dose coefficients laid down in Annex III, Table A of Directive 96/29/Euratom; or

(b)more recent information recognised by the Welsh Ministers, on the basis of the annual intake of water (730 1 for adults).

10.  Where the following formula is satisfied, it can be assumed that the indicative dose is less than the parametric value of 0,1 mSv and no further investigation is required–

where:

  • Ci(obs) = observed concentration of radionuclide i

  • Ci(der) = derived concentration of radionuclide i

  • n = number of radionuclides detected.

Derived concentrations for radioactivity in water intended for human consumption

OriginNuclideDerived concentration
(1)

This table includes values for the most common natural and artificial radionuclides; these are precise values, calculated for a dose of 0,1 mSV, an annual intake of 730 litre and using the dose coefficients laid down in Annex III, Table A of Directive 96/29/ Euratom; derived concentrations for other radionuclides can be calculated on the same basis, and values can be updated on the basis of more recent information recognised by the Welsh Ministers.

(2)

This table allows only for the radiological properties of uranium, not for its chemical toxicity.

Natural

U-238

3,0 Bq/1

U-234

2,8 Bq/1

Ra-226

0,5 Bq/1

Ra-228

0,2 Bq/1

Pb-210

0,2 Bq/1

Po-210

0,1 Bq/1

Artificial

C-14

240 Bq/1

Sr-90

4,9 Bq/1

Pu-239/Pu-240

0,6 Bq/1

Am-241

0,7 Bq/1

Co-60

40 Bq/1

Cs-134

7,2 Bq/1

Cs-137

11 Bq/1

1-131

6,2 Bq/1

Performance characteristics and methods of analysisE+W

11.  For the following parameters and radionuclides, the method of analysis used must, as a minimum, be capable of measuring activity concentrations with a limit of detection specified below:

Parameters and radionuclidesLimit of detection (Notes 1,2)Notes

Tritium

10 Bq/1

Note 3

Radon

10 Bq/1

Note 3

gross alpha

0,04 Bq/1

Note 4

gross beta

0,4 Bq/1

Note 4

U-238

0,02 Bq/1

U-234

0,02 Bq/1

Ra-226

0,04 Bq/1

Ra-228

0,02 Bq/1

Note 5

Pb-210

0,02 Bq/1

Po-210

0,01 Bq/1

C-14

20 Bq/1

Sr-90

0,4 Bq/1

Pu-239/Pu-240

0,04 Bq/1

Am-241

0,06 Bq/1

Co-60

0,5 Bq/1

Cs-134

0,5 Bq/1

Cs-137

0,5 Bq/1

I-131

0,5 Bq/1

Note 1: The limit of detection must be calculated according to the ISO standard 11929: Determination of the characteristic limits (decision threshold, detection limit, and limits of confidence interval) for measurements of ionising radiation – Fundamentals and application, with probabilities of errors of 1st and 2nd kind of 0,05 each.

Note 2: Measurement uncertainties must be calculated and reported as complete standard uncertainties, or as expanded uncertainties with an expansion factor of 1,96 according the ISO Guide for the Expression of Uncertainty in Measurement.

Note 3: The limit of detection for tritium and for radon is 10% of its parametric value of 100 Bq/1.

Note 4: The limit of detection for gross alpha activity and gross beta activities are 40% of the screening values of 0,1 and 1,0 Bq/1 respectively.

Note 5: This limit of detection applies only to initial screening for indicative dose for a new water source; if initial checking indicates that it is not plausible that Ra-228 exceeds 20% of the derived concentration, the limit of detection may be increased to 0,08 Bq/1 for routine Ra-228 nuclide specific measurements, until a subsequent re-check is required.]

Yn ôl i’r brig

Options/Help

You have chosen to open yr Offeryn Cyfan

Yr Offeryn Cyfan you have selected contains over 200 provisions and might take some time to download. You may also experience some issues with your browser, such as an alert box that a script is taking a long time to run.

Would you like to continue?