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The Private Water Supplies Regulations (Northern Ireland) 2017

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Regulation 5

SCHEDULE 1Prescribed Concentrations and Values

This schedule has no associated Explanatory Memorandum

PART 1Wholesomeness

TABLE A

MICROBIOLOGICAL PARAMETERS

Prescribed concentrations and values

Parameter

Parametric value

(number/volume)

Enterococci0/100 ml
Escherichia coli (E.Coli)0/100 ml

TABLE B

CHEMICAL PARAMETERS

Prescribed concentrations and values

Part I: Directive requirements -Prescribed concentrations and values
ParameterParametric valueUnit
(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 relevant person (in relation to a supply of water for human consumption purposes) must strive for a lower value.

(3)

See also the nitrate-nitrite formula in regulation 5(c).

(4)

The additional parametric value of 0.10 mg/l applies only if the water is subject to treatment to improve its quality. The point of compliance for this additional parametric value is the point at which the water flows out from the treatment works.

(5)

“Pesticide” means an organic insecticide, organic herbicide, organic fungicide, organic nematocide, organic acaricide, organic algicide, organic rodenticide, organic slimicide, a related product (including inter alia, growth regulator) and any relevant metabolite, degradation or reaction product. Only those pesticides which are likely to be present in a supply of water need to be monitored.

(6)

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

(7)

The parametric value for this parameter is the sum of all individual pesticides detected and quantified in the monitoring procedure.

(8)

The parametric value for this parameter is the sum of the concentrations of benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene and indeno(1,2,3-cd)pyrene.

(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.

Acrylamide(1)0.10μg/l
Antimony5.0μg/l
Arsenic10μg/l
Benzene1.0μg/l
Benzo(a)pyrene0.010μg/l
Boron1.0mg/l
Bromate(2)10μg/l
Cadmium5.0μg/l
Chromium50μg/l
Copper2.0mg/l
Cyanide50μg/l
1,2-dichloroethane3.0μg/l
Epichlorohydrin(1)0.10μg/l
Fluoride1.5mg/l
Lead10μg/l
Mercury1.0μg/l
Nickel20μg/l
Nitrate(3)50mg/l
Nitrite(3) (4)0.50mg/l
0.10(4)mg/l
Pesticides(5) (6)
Aldrin0.030μg/l
Dieldrin0.030μg/l
Heptachlor0.030μg/l
Heptachlor epoxide0.030μg/l
Other pesticide0.10μg/l
Pesticides: total(5) (7)0.50μg/l
Polycyclic aromatic hydrocarbons(8)0.10μg/l
Selenium10μg/l
Tetrachloroethene and trichloroethene(9)10μg/l
Trihalomethanes: total(9) (10)100μg/l
Vinyl chloride(1)0.50μg/l
Part II: National Requirements
Aluminium200μg/l
Colour20mg/l Pt/Co
Iron200μg/l
Manganese50μg/l
OdourAcceptable to consumers and no abnormal change
Sodium200mg/l
TasteAcceptable to consumers and no abnormal change
Tetrachloromethane3μg/l
Turbidity4NTU

PART 2Indicator Parameters

TABLE C

Prescribed concentrations and values

ParameterParametric valueUnit
(1)

The water must not be aggressive.

(2)

Excluding tritium, potassium-40, radon and radon decay products.

(3)

Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out under Schedule 3 Part 1 to ensure efficacy of treatment.

(4)

If the gross alpha activity exceeds 0.1Bq/l or the gross beta activity exceeds 1.0Bq/l analysis for specific radionuclides is required.

(5)

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

(6)

Remedial action is deemed to be justified on radiological ground without further consideration, where radon exceeds 1,000Bq/l.

(7)

Only in the case of surface water treatment where the parametric value should be strived for the water ex-treatment works.

Ammonium0.50mg/l
Chloride(1)250mg/l

Clostridium perfringens

(including spores)

0number/100 ml
Coliform bacteria0Number/100ml
Colony count 22 °CNo abnormal changenumber/1 ml
Conductivity(1)2500μS/cm at 20 °C
Hydrogen ion concentration(1)≥ 6.5 and ≤ 9.5pH units
Indicative Dose (for radioactivity)(2) (3) (4)0.10mSv
Sulphate(1)250mg/l
Radon (for radioactivity)(3) (6)100Bq/l
Total organic carbonNo abnormal changemg/l
Tritium (for radioactivity)(3) (5)100Bq/l
Turbidity(7)1NTU

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