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The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017

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3.  Until 31st December 2019, the enforcing authority may, for a parameter in Table 2, use the correponding ‘trueness’, ‘precision’ and ‘limit of detection’ in that table as an alternative set of performance characteristics (instead of using the limit of quantification and the uncertainty of measurement referred to in paragraph 1(1)).

TABLE 1

Minimum performance characteristic: uncertainty of measurement

Parameter

Uncertainty of measurement

(% of parametric value, except pH) (Note 1)

Notes(1)
Aluminium25
Ammonium40
Antimony40
Arsenic30
Benzo(a)pyrene50Note 5
Benzene40
Boron25
Bromate40
Cadmium25
Chloride15
Chromium30
Conductivity20
Copper25
Cyanide30Note 6
1,2-dichloroethane40
Fluoride20
Hydrogen ion concentration (in pH)0.2Note 7
Iron30
Lead25
Manganese30
Mercury30
Nickel25
Nitrate15
Nitrite20
Oxidisability50Note 8
Pesticides30Note 9
Polycyclic aromatic hydrocarbons30Note 10
Selenium40
Sodium15
Sulphate15
Tetrachloroethene30Note 11
Trichloroethene40Note 11
Trihalomethanes: total40Note 10
Total organic carbon30Note 12
Turbidity30Note 13

TABLE 2

Minimum performance characteristics: trueness, precision and limit of detection

Parameter

Trueness

(% of parametric value, except for pH) (Note 2)

Precision

(% of parametric value, except for pH) (Note 3)

Limit of detection

(% of parametric value, except for pH) (Note 4)

Notes(2)
Aluminium101010
Ammonium101010
Antimony252525
Arsenic101010
Benzo(a)pyrene252525
Benzene252525
Boron101010
Bromate252525
Cadmium101010
Chloride101010
Chromium101010
Conductivity101010
Copper101010
Cyanide101010Note 6
1,2-dichloroethane252510
Fluoride101010
Hydrogen ion concentration (in pH)0.20.2Note 7
Iron101010
Lead101010
Manganese101010
Mercury201020
Nickel101010
Nitrate101010
Nitrite101010
Oxidisability252525Note 8
Pesticides252525Note 9
Polycyclic aromatic hydrocarbons252525Note 10
Selenium101010
Sodium101010
Sulphate101010
Tetrachloroethene252510Note 11
Trichloroethene252510Note 11
Trihalomethanes: total252510Note 10
Turbidity252525
(1)

Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.

(2)

Acrylamide, epichlorohydrin and vinyl chloride to be controlled by product specification.

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