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The Water Supply (Water Quality) Regulations (Northern Ireland) 2017

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Regulation 5

SCHEDULE 1PRESCRIBED CONCENTRATIONS AND VALUES

This schedule has no associated Explanatory Memorandum

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TABLE A

MICROBIOLOGICAL PARAMETERS

(1) Item(2) Parameters(3) Concentration or Value (maximum)(4) Unit of measurement(5) Point of Compliance(1)
(1)

Where water is supplied from a tanker see regulation 5(3)(a)

(2)

Compliance required as to 95% of samples taken for coliform bacteria from each service reservoir (regulation 5(6)).

Part I: Directive requirements
1.Enterococci0number/100mlConsumers’ taps
2.Escherichia coli (E. coli)0number/100mlConsumers’ taps
Part II: National requirements
1.Coliform bacteria0number/100mlService reservoirs(2) and water treatment works
2.Escherichia coli (E. coli)0number/100mlService reservoirs and water treatment works

TABLE B

CHEMICAL PARAMETERS

(1) Item(2) Parameters(3) Concentration or Value (maximum)(5) Units of Measurement(6) Point of compliance
(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)

Where possible, without compromising disinfection, a water undertaker (in relation to a supply of water for human consumption purposes) must strive for a lower value.

(3)

See also regulation 8(5).

(4)

See also regulation 5(3)(d).

(5)

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

(6)

The parametric value applies to each individual. “other pesticide” means a pesticide other than aldrin, dieldrin, heptachlor and heptachlor epoxide.

(7)

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

(8)

The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

(9)

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

(10)

The specified compounds are chloroform, bromoform, dibromochloromethane, bromodichloromethane and the parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.

Part I: Directive requirements
1.Acrylamide(1)0.10µg/l
2.Antimony5.0µg/lConsumers’ taps
3.Arsenic10µg/lConsumers’ taps
4Benzene1.0µg/lConsumers’ taps
5Benzo(a)pyrene0.010µg/lConsumers’ taps
6Boron1.0mg/lConsumers’ taps
7Bromate(2)10µg/lConsumers’ taps
8Cadmium5.0µg/lConsumers’ taps
9Chromium50µg/lConsumers’ taps
10Copper(3)2.0mg/lConsumers’ taps
11Cyanide50µg/lConsumers’ taps
121, 2 dichloroethane3.0µg/lConsumers’ taps
13Epichlorohydrin(1)0.10µg/l
14Fluoride1.5mg/lConsumers’ taps
15Lead(3)10µg/lConsumers’ taps
16Mercury1.0µg/lConsumers’ taps
17Nickel(3)20µg/lConsumers’ taps
18Nitrate(4)50mg/lConsumers’ taps
19Nitrite(4)0.50mg/lConsumers’ taps
0.10Treatment works
20

Pesticides(5) (6)

Aldrin

Dieldrin

Heptachlor

Heptachlor epoxide

0.030µg/lConsumers’ taps
other pesticides(5) (6)0.10µg/lConsumers’ taps
21Pesticides: Total(7)0.50µg/lConsumers’ taps
22Polycyclic aromatic hydrocarbons(8)0.10µg/lConsumers’ taps
23Selenium10µg/lConsumers’ taps
24Tetrachloroethene and Trichloroethene(9)10µg/lConsumers’ taps
25Trihalomethanes: Total(10)100µg/lConsumers’ taps
26Vinyl chloride(1)0.50µg/l
Part II: National requirements
1.Aluminium200µg/lConsumers’ taps
2.Colour20mg/l Pt/CoConsumers’ taps
3.Iron200µg/lConsumers’ taps
4.Manganese50µg/lConsumers’ taps
5.OdourAcceptable to consumers and no abnormal changeConsumers’ taps
6.Sodium200mg/lConsumers’ taps
7.TasteAcceptable to consumers and no abnormal changeConsumers’ taps
8.Tetrachloromethane3µg/lConsumers’ taps
9.Turbidity4NTUConsumers’ taps

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