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The Private Water Supplies (Wales) Regulations 2017

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PART 2Indicator Parameters

TABLE C:

Prescribed concentrations, values or states

Parameters

Maximum concentration or value

Units of Measurement

(1)

The water should not be aggressive.

(2)

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

Ammonium0.50mg/l
Chloride(1)250mg/l
Clostridium perfringens (including spores)0Number/100ml
Coliform bacteria0Number/100ml (Number/250ml in the case of water put into bottles or containers)
Colony countsNo abnormal changeNumber/ml at 22ºC
Conductivity(1)2500µS/cm at 20ºC
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(1)250mg/l
Total organic carbon (TOC)No abnormal changemgC/l
Turbidity(2)1NTU

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