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The Private Water Supplies (Wales) Regulations 2010

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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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