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The Water Supply (Water Quality) Regulations 2018

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Regulations 2, 4, 6, 14, 15, 18, 20 and 22

SCHEDULE 1PRESCRIBED CONCENTRATIONS AND VALUES

Table A Microbiological Parameters

Part 1: Directive requirements
ItemParametersConcentration or Value (maximum)Units of MeasurementPoint of compliance
(1)

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

1Enterococci0number/100 mlConsumers’ taps
2E.coli0number/100 mlConsumers’ taps
Part 2: National requirements
1Coliform bacteria0number/100 mlService reservoirs (1) and water treatment works
2E. coli0number/100 mlService reservoirs and water treatment works
Note:

Table B Chemical Parameters

Part 1: National requirements

(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 4(2)(d).

(3)

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

(4)

The parametric value applies to each individual pesticide.

(5)

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

(6)

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.

(7)

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

(8)

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.

ItemParametersConcentration or Value (maximum)Units of MeasurementPoint of compliance
1Acrylamide0.10μg/l(1)
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
10Copper2.0mgCu/lConsumers’ taps
11Cyanide50μgCN/lConsumers’ taps
121, 2 dichloroethane3.0μg/lConsumers’ taps
13Epichlorohydrin0.10μg/l(1)
14Fluoride1.5mgF/lConsumers’ taps
15Lead10μgPb/lConsumers’ taps
16Mercury1.0μgPb/lConsumers’ taps
17Nickel20μgNi/lConsumers’ taps
18Nitrate (2)50mgNO3/lConsumers’ taps
19Nitrite (2)0.50mgNO2/lConsumers’ taps
0.10Treatment Works
20Pesticides (3),(4)
Aldrin0.030μg/lConsumers’ taps
Dieldrin
Heptachlor
Heptachlor
epoxide
other pesticides0.10μg/lConsumers’ taps
21Pesticides: Total (5)0.50μg/lConsumers’ taps
22Polycyclic aromatic hydrocarbons (6)0.10μg/lConsumers’ taps
23Selenium10μgSe/lConsumers’ taps
24Tetrachloroethene and Trichloroethene (7)10μg/lConsumers’ taps
25Trihalomethanes: Total (8)100μg/lConsumers’ taps
26Vinyl chloride0.50μg/l(1)
Notes:

Part 2: 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 changeConsumers’ taps
6Sodium200mgNa/lConsumers’ taps
7TasteAcceptable to consumers and no abnormal changeConsumers’ taps
8Tetrachlorome-thane3μg/lConsumers’ taps
9Turbidity4NTUConsumers’ taps

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