Chwilio Deddfwriaeth

The Private Water Supplies (Wales) Regulations 2017

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PART 1Wholesomeness

TABLE A:

MICROBIOLOGICAL PARAMETERS

Prescribed concentrations or values

Parameters

Maximum concentration or value

Units of Measurement

Escherichia coli (E. coli)0Number/100ml
Enterococci0Number/100ml
In the case of water in bottles or containers:
Escherichia coli (E.coli)0Number/250ml
EnterococciNumber/250ml
Pseudomonas aeruginosa0Number/250ml
Colony count 22ºC100Number/ml

TABLE B:

CHEMICAL PARAMETERS

Prescribed concentrations or values

Parameters

Maximum concentration or value

Units of Measurement

(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 the nitrate-nitrite formula in regulation 4(1)(c).

(3)

For these purposes “Pesticides” means:

  • organic insecticides

  • organic herbicides

  • organic fungicides

  • organic nematocides

  • organic acaricides

  • organic algicides

  • organic rodenticides

  • organic slimicides

  • related products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides likely to be present in a given supply need be monitored.

(4)

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

(5)

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.

The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(6)

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

(7)

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.

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/1
Antimony5.0µg/1
Arsenic10µg/1
Benzene1.0µg/1
Benzo(a)pyrene0.010µg/1
Boron1.0mg/1
Bromate10µg/1
Cadmium5.0µg/1
Chromium50µg/1
Copper2.0mg/1
Cyanide50µg/1
1.2 dichloroethane3.0µg/1
Epichlorohydrin(1)0.10µg/1
Fluoride1.5mg/1
Lead10

µg/1

µg/1

Mercury1.0µg/1
Nickel20µg/1
Nitrate (2)50mg/l
Nitrite (2)0.5 (or 0.1 in the case of treatment works)mg/l
Pesticides (3)Aldrin0.030µg/1
Dieldrin0.030µg/1
Heptachlor0.030µg/1
Heptachlor epoxide0.030µg/1
Other pesticides0.10µg/1
Pesticides total (4)0.50µg/1
Polycyclic aromatic hydrocarbons (5)0.10µg/1
Selenium10µg/1
Tetrachloroethene and Trichloroethene(6)10µg/1
Trihalomethanes: Total(7)100µg/1
Vinyl chloride(1)0.50µg/1

National requirements – Prescribed concentrations or values

Parameters

Maximum concentration or value

Units of Measurement

Aluminium200µg/1
Colour20mg/l Pt/Co
Iron200µg/1
Manganese50µg/1
OdourAcceptable to consumers and no abnormal change
Sodium200mg/l
TasteAcceptable to consumers and no abnormal change
Tetrachloromethane3µg/1
Turbidity4NTU

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