# Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption, Division 1: Chemical and indicator parameters

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

For the parameters set out in Table 1, the specified performance characteristics are that the method of analysis used must, as a minimum, be capable of measuring concentrations equal to the parametric value with a limit of quantification, as defined in Article 2(2) of Commission Directive 2009/90/EC , of 30 % or less of the relevant parametric value and an uncertainty of measurement as specified in Table 1. The result shall be expressed using at least the same number of significant figures as for the parametric value considered in Parts B and C of Annex I.
Until 31 December 2019 Member States may allow for the use of ‘ trueness ’ , ‘ precision ’ and ‘ limit of detection ’ as specified in Table 2, as an alternative set of performance characteristics to ‘ limit of quantification ’ and ‘ uncertainty of measurement ’ as specified respectively in the first paragraph and Table 1.
The uncertainty of measurement laid down in Table 1 shall not be used as an additional tolerance to the parametric values set out in Annex I.
Table 1
Minimum performance characteristic ‘ Uncertainty of measurement ’
Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.
Parameters
Uncertainty of measurement (See Note 1) % of the parametric value (except for pH)
Notes
Aluminium
25
Ammonium
40
Antimony
40
Arsenic
30
Benzo(a)pyrene
50
See Note 5
Benzene
40
Boron
25
Bromate
40
Cadmium
25
Chloride
15
Chromium
30
Conductivity
20
Copper
25
Cyanide
30
See Note 6
1,2-dichloroethane
40
Fluoride
20
Hydrogen ion concentration pH (expressed in pH units)
0,2
See Note 7
Iron
30
Lead
25
Manganese
30
Mercury
30
Nickel
25
Nitrate
15
Nitrite
20
Oxidisability
50
See Note 8
Pesticides
30
See Note 9
Polycyclic aromatic hydrocarbons
50
See Note 10
Selenium
40
Sodium
15
Sulphate
15
Tetrachloroethene
30
See Note 11
Trichloroethene
40
See Note 11
Trihalomethanes — total
40
See Note 10
Total organic carbon (TOC)
30
See Note 12
Turbidity
30
See Note 13
Table 2
Minimum performance characteristics ‘ Trueness ’ , ‘ precision ’ and ‘ limit of detection ’ — may be used until 31 December 2019
Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.
Parameters
Trueness (See Note 2) % of the parametric value (except for pH)
Precision (See Note 3) % of the parametric value (except for pH)
Limit of detection (See Note 4) % of the parametric value (except for pH)
Notes
Aluminium
10
10
10
Ammonium
10
10
10
Antimony
25
25
25
Arsenic
10
10
10
Benzo(a)pyrene
25
25
25
Benzene
25
25
25
Boron
10
10
10
Bromate
25
25
25
Cadmium
10
10
10
Chloride
10
10
10
Chromium
10
10
10
Conductivity
10
10
10
Copper
10
10
10
Cyanide
10
10
10
See Note 6
1,2-dichloroethane
25
25
10
Fluoride
10
10
10
Hydrogen ion concentration pH (expressed in pH units)
0,2
0,2
See Note 7
Iron
10
10
10
Lead
10
10
10
Manganese
10
10
10
Mercury
20
10
20
Nickel
10
10
10
Nitrate
10
10
10
Nitrite
10
10
10
Oxidisability
25
25
10
See Note 8
Pesticides
25
25
25
See Note 9
Polycyclic aromatic hydrocarbons
25
25
25
See Note 10
Selenium
10
10
10
Sodium
10
10
10
Sulphate
10
10
10
Tetrachloroethene
25
25
10
See Note 11
Trichloroethene
25
25
10
See Note 11
Trihalomethanes — total
25
25
10
See Note 10
Turbidity
25
25
25

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Source: https://www.legislation.gov.uk/eudr/1998/83/annex/III/part/B/division/1 (the official version)
Page: https://openlegislation.uk/eu-directive-1998-83/annex-III/part-B/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.