# The Public Water Supplies (Scotland) Amendment Regulations 2022, Schedule 3: SUBSTITUTION OF TABLE 1 IN SCHEDULE 3 OF THE 2014 REGULATIONS


“
Minimum performance characteristic: uncertainty of measurement
Parameter
Uncertainty of measurement (% of prescribed concentration or value, except pH) (Note 1)
Notes
Notes—
Note 1: Uncertainty of measurement is a non-negative parameter characterising the dispersion of the quantity values being attributed to a measurand, based on the information used. The performance criterion for measurement uncertainty (k = 2) is the percentage of the parametric value stated in the table or any stricter value. The uncertainty of measurement must be estimated at the level of the parametric value, unless otherwise specified.
Note 2: If the value of uncertainty of measurement cannot be met, the best available technique must be selected (up to 60%).
Note 3: The method determines total cyanide in all forms.
Note 4: The value for the uncertainty of measurement is expressed in pH units.
Note 5: Reference method European standard EN ISO 8467:1995 entitled “ Water quality - Determination of permanganate index (ISO 8467:1993)” .
Note 6: The performance characteristics for individual pesticides are given as an indication. Values for the uncertainty of measurement as low as 30 % can be achieved for several pesticides, higher values up to 80% may be allowed for a number of pesticides.
Note 7: The performance characteristics apply to individual substances, specified at 25% of the prescribed concentration or value for the corresponding parameter in Table B.
Note 8: The performance characteristics apply to individual substances, specified at 50% of the prescribed concentration or value for the corresponding parameter in Table B.
Note 9: The uncertainty of measurement must be estimated at the level of 3 mg/l of the total organic carbon in accordance with European standard EN 1484:1997 entitled “ Water analysis - Guidelines for the determination of total organic carbon and dissolved organic carbon” .
Note 10: The uncertainty of measurement must be estimated at the level of 1.0 nephelometric turbidity units in accordance with European standard EN ISO 7027-1:2016 entitled “ Water quality - Determination of turbidity - Part 1: Quantitative methods (ISO 7027-1:2016)” or another equivalent standard method.
Aluminium
25
Ammonium
40
Acrylamide
30
Antimony
40
Arsenic
30
Benzo(a)pyrene
50
Note 2
Benzene
40
Bisphenol A
50
Boron
25
Bromate
40
Cadmium
25
Chloride
15
Chlorate
40
Chlorite
40
Chromium
30
Conductivity
20
Copper
25
Cyanide
30
Note 3
1,2-dichloroethane
40
Epichlorohydrin
30
Fluoride
20
HAAs
50
Hydrogen ion concentration (in pH)
0.20
Note 4
Iron
30
Lead
30
Manganese
30
Mercury
30
Microcystin-LR
30
Nickel
25
Nitrate
15
Nitrite
20
Oxidisability
50
Note 5
Pesticides
30
Note 6
PFAS
50
Polycyclic aromatic hydrocarbons
40
Note 7
Selenium
40
Sodium
15
Sulphate
15
Tetrachloroethene
40
Note 8
Trichloroethene
40
Note 8
Trihalomethanes – total
40
Note 7
Total organic carbon
30
Note 9
Turbidity
30
Note 10
Uranium
30
Vinyl chloride
50
”

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Source: https://www.legislation.gov.uk/sdsi/2022/9780111055663/schedule/3 (the official version)
Page: https://openlegislation.uk/draft-public-water-supplies-scotland-amendment-regulations-2022/schedule-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.