# Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption, Part C: Indicator parameters

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

Parameter
Parametric value
Unit
Notes
Aluminium
200
μg/l
Ammonium
0,50
mg/l
Chloride
250
mg/l
Note 1
Clostridium perfringens (including spores)
0
number/100 ml
Note 2
Colour
Acceptable to consumers and no abnormal change
Conductivity
2 500
μS cm-1 at 20 °C
Note 1
Hydrogen ion concentration
≥ 6,5 and ≤ 9,5
pH units
Notes 1 and 3
Iron
200
μg/l
Manganese
50
μg/l
Odour
Acceptable to consumers and no abnormal change
Oxidisability
5,0
mg/l O2
Note 4
Sulphate
250
mg/l
Note 1
Sodium
200
mg/l
Taste
Acceptable to consumers and no abnormal change
Colony count 22o
No abnormal change
Coliform bacteria
0
number/100 ml
Note 5
Total organic carbon (TOC)
No abnormal change
Note 6
Turbidity
Acceptable to consumers and no abnormal change
Note 7
RADIOACTIVITY
Parameter
Parametric value
Unit
Notes
Tritium
100
Bq/l
Notes 8 and 10
Total indicative dose
0,10
mSv/year
Notes 9 and 10

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Source: https://www.legislation.gov.uk/eudr/1998/83/annex/I/part/C (the official version)
Page: https://openlegislation.uk/eu-directive-1998-83/annex-I/part-C
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.