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

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)
Aluminium	25
Ammonium	40
Antimony	40
Arsenic	30
Benzo(a)pyrene	50	Note 5
Benzene	40
Boron	25
Bromate	40
Cadmium	25
Chloride	15
Chromium	30
Conductivity	20
Copper	25
Cyanide	30	Note 6
1,2-dichloroethane	40
Fluoride	20
Hydrogen ion concentration (in pH)	0.2	Note 7
Iron	30
Lead	25
Manganese	30
Mercury	30
Nickel	25
Nitrate	15
Nitrite	20
Oxidisability	50	Note 8
Pesticides	30	Note 9
Polycyclic aromatic hydrocarbons	30	Note 10
Selenium	40
Sodium	15
Sulphate	15
Tetrachloroethene	30	Note 11
Trichloroethene	40	Note 11
Trihalomethanes: total	40	Note 10
Total organic carbon	30	Note 12
Turbidity	30	Note 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)
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	Note 6
1,2-dichloroethane	25	25	10
Fluoride	10	10	10
Hydrogen ion concentration (in pH)	0.2	0.2		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	25	Note 8
Pesticides	25	25	25	Note 9
Polycyclic aromatic hydrocarbons	25	25	25	Note 10
Selenium	10	10	10
Sodium	10	10	10
Sulphate	10	10	10
Tetrachloroethene	25	25	10	Note 11
Trichloroethene	25	25	10	Note 11
Trihalomethanes: total	25	25	10	Note 10
Turbidity	25	25	25

(1)

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

(2)

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