# The Private Water Supplies (England) Regulations 2016, Part 2: Indicator parameters (excluding radioactive substances)

Extent: E+W+S+N.I.

Table C
Prescribed concentrations, values or states
1 The water should not be aggressive.
2 Only in the case of surface water or groundwater that has been influenced by surface water.
Parameters
Maximum concentration or value or state (unless otherwise stated)
Units of measurement
Ammonium
0.50
mg/l
Chloride1
250
mg/l
Clostridium perfringens (including spores)
0
Number/100ml
Number/100ml (Number/250
Coliform bacteria
0
ml in the case of water put into bottles of containers)
. . .
. . .
Colony counts
No abnormal change
Number/ml at 22°C
Conductivity1
2500
μS/cm at 20°C
Hydrogen ion
9.5 (maximum)
pH value
6.5 (minimum) (in the case of
still water put into bottles or containers the minimum is 4.5)
pH value
Sulphate1
250
mg/l
Total organic carbon (TOC)
No abnormal change
mgC/l
Turbidity2
1
NTU

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Source: https://www.legislation.gov.uk/uksi/2016/618/schedule/1/part/2 (the official version)
Page: https://openlegislation.uk/private-water-supplies-england-regulations-2016/schedule-1/part-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.