# The Water Supply (Water Quality) Regulations 2016, Schedule 1: Prescribed concentrations and values


Table A
Microbiological parameters
Part I: Directive requirements
(1)
(2)
(3)
(4)
(5)
Item
Parameters
Concentration or value (maximum)
Units of measurement
Point of compliance
1.
Enterococci
0
number/100ml
Consumers' taps
2.
Escherichia coli
0
number/100ml
Consumers' taps
(E. coli)
Part II: National requirements
1 Compliance required as to 95% of samples from each service reservoir (regulation 4(6)).
(1)
(2)
(3)
(4)
(5)
Item
Parameters
Concentration or value (maximum)
Units of measurement
Point of compliance
1.
Coliform bacteria
0
number/100ml
Service reservoirs1 and water treatment works
2.
Escherichia coli (E. coli)
0
number/100ml
Service reservoirs and water treatment works
Table B
Chemical parameters
Part I: Directive 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—
The specified compounds are—
— benzo(b)fluoranthen;
— 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—
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)
(2)
(3)
(4)
(5)
Item
Parameters
Concentration or value (maximum)
Units of measurement
Point of compliance
1.
Acrylamide
0.10
µg/1
1
2.
Antimony
5.0
µgSb/1
Consumers' taps
3.
Arsenic
10
µgAs/1
Consumers' taps
4.
Benzene
1.0
µg/1
Consumers' taps
5.
Benzo(a)pyrene
0.010
µg/1
Consumers' taps
6.
Boron
1.0
mgB/1
Consumers' taps
7.
Bromate
10
µgBrO3/1
Consumers' taps
8.
Cadmium
5.0
µgCd/1
Consumers' taps
9.
Chromium
50
µgCr/1
Consumers' taps
10.
Copper
2.0
mgCu/1
Consumers' taps
11.
Cyanide
50
µgCN/1
Consumers' taps
12.
1, 2 dichloroethane
3.0
µg/1
Consumers' taps
13.
Epichlorohydrin
0.10
µg/1
1
14.
Fluoride
1.5
mgF/1
Consumers' taps
15.
Lead
10
µgPb/1
Consumers' taps
16.
Mercury
1.0
µgHg/1
Consumers' taps
17.
Nickel
20
µgNi/1
Consumers' taps
18.
Nitrate2
50
mgNO3/1
Consumers' taps
19.
Nitrite2
0.50
mgNO2/1
Consumers' taps
0.10
Treatment works
20.
Pesticides34
0.030
µg/1
Consumers' taps
Aldrin
Dieldrin
0.030
µg1
Consumer's taps
Heptachlor
Heptachlor epoxide
Other pesticides
0.10
μg/l
Consumers' taps
21.
Pesticides: total5
0.50
µg/1
Consumers' taps
22.
Polycyclic aromatic hydrocarbon6
0.10
µg/1
Consumers' taps
23.
Selenium
10
µgSe/1
Consumers' taps
24.
Tetrachloroethene and Trichloroethene7
10
μg/l
Consumers' taps
25.
Trihalomethanes: Total8
100
µg/1
Consumers' taps
26.
Vinyl chloride
0.50
µg/1
1
Part II: National requirements
(1)
(2)
(3)
(4)
(5)
Item
Parameters
Concentration or value (maximum)
Units of measurement
Point of compliance
1.
Aluminium
200
µgA1/1
Consumers' taps
2.
Colour
20
mg/1 Pt/Co
Consumers' taps
3.
Iron
200
µgFe/1
Consumers' taps
4.
Manganese
50
µgMn/1
Consumers' taps
5.
Odour
Acceptable to consumers and no abnormal change
Consumers' taps
6.
Sodium
200
mgNa/1
Consumers' taps
7.
Taste
Acceptable to consumers and no abnormal change
Consumers' taps
8.
Tetrachloromethane
3
µg/1
Consumers' taps
9.
Turbidity
4
NTU
Consumers' taps

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Source: https://www.legislation.gov.uk/uksi/2016/614/schedule/1 (the official version)
Page: https://openlegislation.uk/water-supply-water-quality-regulations-2016/schedule-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.