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The Water Supply (Water Quality) Regulations 2000

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regulations 2 and 4

SCHEDULE 1PRESCRIBED CONCENTRATIONS AND VALUES

TABLE A

MICROBIOLOGICAL PARAMETERS

Part I: Directive requirements
ItemParametersConcentration or Value maximum)Units of MeasurementPoint of compliance
1.Enterococci0number/100mlConsumers' taps
2.Escherichia coli (E. coli)0number/100mlConsumers' taps
Part II: National requirements
ItemParametersConcentration or Value maximum)Units of MeasurementPoint of compliance
Note:
*

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

1.Coliform bacteria0number/100mlService reservoirs* and water treatment works
2.Escherichia coli (E. coli)0number/100mlService reservoirs and water treatment works

TABLE B

CHEMICAL PARAMETERS

Part I: Directive requirements
ItemParametersConcentration or Value maximum)Units of MeasurementPoint of compliance
Notes:
(i)

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.

(ii)

See also regulation 6(6).

(iii)

See also regulation 4(2)(d).

(iv)

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

(v)

The parametric value applies to each individual pesticide.

(vi)

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

(vii)

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.

(viii)

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

(ix)

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.

1.Acrylamide0.10μg/l(i)
2.Antimony5.0μgSb/lConsumers' taps
3.Arsenic10μgAs/lConsumers' taps
4.Benzene1.0μg/lConsumers' taps
5.Benzo(a)pyrene0.010μg/lConsumers' taps
6.Boron1.0mgB/lConsumers' taps
7.Bromate10μgBrO3/lConsumers' taps
8.Cadmium5.0μgCd/lConsumers' taps
9.Chromium50μgCr/lConsumers' taps
10.Copper(ii)2.0mgCu/lConsumers' taps
11.Cyanide50μgCN/lConsumers' taps
12.1, 2 dichloroethane3.0μg/lConsumers' taps
13.Epichlorohydrin0.10μg/l(i)
14.Fluoride1.5mgF/lConsumers' taps
15.Lead (ii)(a) 25, from 25th December 2003 until immediately before 25th December 2013μgPb/lConsumers' taps
(b) 10, on and after 25th December 2013μgPb/lConsumers' taps
16.Mercury1.0μgHg/lConsumers' taps
17.Nickel (ii)20μgNi/lConsumers' taps
18.Nitrate (iii)50mgNO3/lConsumers' taps
19.Nitrite (iii)0.50mgNO2/lConsumers' taps
0.10Treatment works
20.Pesticides (iv)(v)
Aldrin0.030μg/lConsumers' taps
Dieldrin
Heptachlor
Heptachlor epoxide
other pesticides0.10μg/lConsumers' taps
21.Pesticides: Total (vi)0.50μg/lConsumers' taps
22.Polycyclic aromatic hydrocarbons (vii)0.10μg/lConsumers' taps
23.Selenium10μgSe/lConsumers' taps
24.Tetrachloroethene and Trichloroethene (viii)10μg/lConsumers' taps
25.Trihalomethanes: Total (ix)100μg/lConsumers' taps
26.Vinyl chloride0.50μg/l(i)
Part II: National requirements
ItemParametersConcentration or Value (maximum unless otherwise stated)Units of MeasurementPoint of compliance
1.Aluminium200μgAl/lConsumers' taps
2.Colour20mg/l Pt/CoConsumers' taps
3.Hydrogen ion10.0pH valueConsumers' taps
6.5 (minimum)pH value
4.Iron200μgFe/lConsumers' taps
5.Manganese50μgMn/lConsumers' taps
6.Odour3 at 25°CDilution numberConsumers' taps
7.Sodium200mgNa/lConsumers' taps
8.Taste3 at 25°CDilution numberConsumers' taps
9.Tetrachloromethane3μg/lConsumers' taps
10.Turbidity4NTUConsumers' taps

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