The Public Water Supplies (Scotland) Amendment Regulations 2022

Regulation 16(a)

SCHEDULE 1 SUBSTITUTION OF TABLE B IN SCHEDULE 1 OF THE 2014 REGULATIONS

“TABLE B

CHEMICAL PARAMETERS

(1)	(2)	(3)	(4)	(5)	(6)
Notes—
Note 1: The parametric value of 0.10 μg/l refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water.
Note 2: A parametric value of 2.4 mgB/l must be applied when desalinated water is the predominant water source of the supply system concerned or in regions where geological conditions could lead to high levels of boron in groundwater.
Note 3: A parametric value of 0.70 mg/l must be applied where a disinfection method that generates this parameter, in particular chlorine dioxide, is used for disinfection of water intended for human consumption. This parametric value applies only if such disinfection methods are used.
Note 4: This parameter must be measured only when disinfection methods that can generate HAAs are used for the disinfection of water intended for human consumption.
Note 5: This parameter must be measured only in the event of potential blooms in source water (increasing cyanobacterial cell density or bloom forming potential).
Note 6: See also regulation 4(2)(c).
Note 7: The corresponding parametric value applies to each “other pesticide” individually.
Note 8: A parametric value of 30 μg/l must be applied for regions where geological conditions could lead to high levels of selenium in groundwater.
Note 9: The sum of concentrations of these two parameters.
Note 10: The parametric value of 0.50 μg/l refers to the residual monomer concentration in the water as calculated according to specifications of the maximum release from the corresponding polymer in contact with the water.”
Item	Parameter	Concentrat-ion or value (maximum)	Units of measurement	Point of compliance	Notes
Part 1
1.	Acrylamide	0.10	μg/l	Consumer’s tap	Note 1
2.	Antimony	10	μgSb/l	Consumer’s tap
3.	Arsenic	10	μgAs/l	Consumer’s tap
4.	Benzene	1.0	μg/l	Consumer’s tap
5.	Benzo(a)pyrene	0.010	μg/l	Consumer’s tap
6.	Bisphenol A	2.5	μg/l	Consumer’s tap
7.	Boron	1.5	mgB/l	Consumer’s tap	Note 2
8.	Bromate	10	μgBrO3/l	Consumer’s tap
9.	Cadmium	5.0	μgCd/l	Consumer’s tap
10.	Chlorate	0.25	mg/l	Consumer’s tap	Note 3
11.	Chlorite	0.25	mg/l	Consumer’s tap	Note 3
12.	Chromium	50	μgCr/l	Consumer’s tap
13.	Copper	2.0	mgCu/l	Consumer’s tap
14.	Cyanide	50	μgCN/l	Consumer’s tap
15.	1,2-dichloroethane	3.0	μg/l	Consumer’s tap
16.	Epichlorohydrin	0.10	μg/l	Consumer’s tap	Note 1
17.	Fluoride	1.5	mgF/l	Consumer’s tap
18.	HAAs	60	μg/l	Consumer’s tap	Note 4
19.	Lead	10	μgPb/l	Consumer’s tap
20.	Mercury	1.0	μgHg/l	Consumer’s tap
21.	Microcystin-LR	1.0	μg/l	Consumer’s tap	Note 5
22.	Nickel	20	μgNi/l	Consumer’s tap
23.	Nitrate	50	mgNO3/l	Consumer’s tap	Note 6
24.	Nitrite	0.50	mgNO2/l	Consumer’s tap	Note 6
		0.10	mgNO2/l	Treatment works
25.	Pesticides—
	Aldrin	0.030	μg/l	Consumer’s tap
	Dieldrin	0.030	μg/l	Consumer’s tap
	Heptachlor	0.030	μg/l	Consumer’s tap
	Heptachlor epoxide	0.030	μg/l	Consumers’ tap
	Other pesticide	0.10	μg/l	Consumer’s tap	Note 7
26.	Pesticides: total	0.50	μg/l	Consumer’s tap
27.	Sum of PFAS	0.1	μg/l	Consumer’s tap
28.	PAH Total	0.10	μg/l	Consumer’s tap
29.	Selenium	20	μgSe/l	Consumer’s tap	Note 8
30.	Tetrachloroethene and trichloroethene	10	μg/l	Consumer’s tap	Note 9
31.	THM: Total	100	μg/l	Consumer’s tap
32.	Uranium	30	μg/l	Consumer’s tap
33.	Vinyl chloride	0.50	μg/l		Note 10
Part 2
34.	Aluminium	200	μgAl/l	Consumer’s tap
35.	Colour	20	mg/1 Pt/Co	Consumer’s tap
36.	Iron	200	μgFe/l	Consumer’s tap
37.	Manganese	50	μgMn/l	Consumer’s tap
38.	Sodium	200	mgNa/1	Consumer’s tap
39.	Tetrachlorometh-ane	3	μg/l	Consumer’s tap
40.	Turbidity	4	NTU	Consumer’s tap