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The Private Water Supplies (Wales) Regulations 2010

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Regulations 4, 10, 15 and 17

SCHEDULE 1Concentrations or Values

PART 1Wholesomeness

TABLE A: MICROBIOLOGICAL PARAMETERS

Prescribed concentrations or values

ParametersMaximum concentration or valueUnits 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
Enterococci0Number/250ml
Pseudomonas aeruginosa0Number/250ml
Colony count 22°C100Number/ml
Colony count 37°C20Number/ml

TABLE B:CHEMICAL PARAMETERS

Prescribed concentrations or values

ParametersMaximum concentration or valueUnits of Measurement
(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 the nitrate-nitrite formula in regulation 4(c).

(iii)

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.

(iv)

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

(v)

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.

(vi)

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

(vii)

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.

Acrylamide (i)0.10μg/l
Antimony5.0μg/l
Arsenic10μg/l
Benzene1.0μg/l
Benzo(a)pyrene0.010μg/l
Boron1.0mg/l
Bromate10μg/l
Cadmium5.0μg/l
Chromium50μg/l
Copper2.0mg/l
Cyanide50μg/l
1, 2 dichloroethane3.0μg/l
Epichlorohydrin (i)0.10μg/l
Fluoride1.5mg/l
Lead25 (until 25th December 2013)μg/l
10 (from 25th December 2013)μg/l
Mercury1.0μg/l
Nickel20μg/l
Nitrate (ii)50mg/l
Nitrite(ii)0.5 (or 0.1 in the case of treatment works)mg/l
Pesticides (iii)
  • Aldrin

0.030μg/l
  • Dieldrin

0.030μg/l
  • Heptachlor

0.030μg/l
  • Heptachlor epoxide

0.030μg/l
  • Other pesticides

0.10μg/l
  • Pesticides total (iv)

0.50μg/l
Polycyclic aromatic hydrocarbons (v)0.10μg/l
Selenium10μg/l
Tetrachloroethene and Trichloroethene (vi)10μg/l
Trihalomethanes: Total (vii)100μg/l
Vinyl chloride (i)0.50μg/l

National requirements — Prescribed concentrations or values

ParametersMaximum concentration or valueUnits of Measurement
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, values or states

ParametersMaximum concentration or value or state (unless otherwise stated)Units of measurement
(i)

The water should not be aggressive.

(ii)

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

(iii)

Only in the case of surface water or groundwater that has been influenced by surface water.

Ammonium0.50mg/l
Chloride (i)250mg/l
Clostridium perfringens0Number/100ml
(including spores)
Coliform bacteria0Number/100ml (Number/250ml in the case of water put into bottles or containers)
Colony countsNo abnormal changeNumber/ml at 22°C
No abnormal changeNumber/ml at 37°C
Conductivity (i)2500μS/cm at 20°C
Hydrogen ion9.5 (maximum)pH value
6.5 (minimum) (in the case of still water put into bottles or containers the minimum is 4.5)pH value
Sulphate (i)250mg/l
Total indicative dose (for radioactivity) (ii)0.10mSv/year
Total organic carbon (TOC)No abnormal changemgC/l
Tritium
(for radioactivity)100Bq/l
Turbidity(iii)1NTU

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