The Public Water Supplies (Scotland) Regulations 2014

Regulation 2(1) and (4)

SCHEDULE 1 S PRESCRIBED CONCENTRATIONS AND VALUES

TABLE A

MICROBIOLOGICAL PARAMETERS

1 The parametric values in Part 2 are not required to protect human health (since the parametric values in Part 1 are sufficient for that purpose). The values in Part 2 are not therefore set for the purposes of Article 5(3) of the Directive.
2 Compliance required as to 95% of samples from each service reservoir (regulation 4(4)).
(1)Item	(2)Parameter	(3)Concentration orvalue (maximum)	(4)Units ofmeasurement	(5)Point ofcompliance
Part 1
1.	Enterococci	0	Number/100ml	Consumer's tap
2.	Escherichia coli	0	Number/100ml	Consumer's tap
Part 21
3.	Coliform bacteria	0	Number/100ml	Service reservoir2
		0	Number/100ml	Treatment works
4.	Escherichia coli	0	Number/100ml	Service reservoir
		0	Number/100ml	Treatment works
Notes—

[F1 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

Textual Amendments

F1 Sch. 1 Table B and notes substituted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), reg. 1(1), sch. 1

[F2 TABLE C

Indicator Parameters

(1)	(2)	(3)	(4)	(5)	(6)
Notes—
Note 1: Water must not be aggressive or corrosive. This applies particularly to water undergoing treatment (demineralisation, softening, membrane treatment, reverse osmosis, etc.).
Note 2: Where water intended for human consumption is derived from treatment that significantly demineralises or softens water, calcium and magnesium salts could be added to condition the water in order to reduce any possible negative health impact, as well as to reduce the corrosiveness or aggressivity of water and to improve taste. Minimum concentrations of calcium and magnesium or total dissolved solids in softened or demineralised water could be established taking into account the characteristics of water that enters those processes.
Note 3: The water must not be corrosive.
Note 4: This parameter must be measured if a risk assessment under regulation 30(2) indicates that it is appropriate to do so.
Note 5: For water put into bottles or containers (which is not intended for sale for drinking by humans), the unit is number/250ml.
Note 6: The water must not be aggressive.
Note 7: For water put into bottles or containers (which is not intended for sale for drinking by humans), the minimum value is 4.5 pH units.
Note 8: This parameter need not be measured for supplies of less than 10,000 m³ a day.
Note 9: Remedial action is to be deemed justified on radiological protection grounds, without further consideration where radon concentrations exceed 1,000 Bq/l.
Note 10: If the concentration of tritium exceeds this value, an analysis of the presence of other artificial radionuclides must also be carried out by Scottish Water.]
Item	Parameter	Concentration or value (maximum) or state	Units of measurement	Point of monitoring	Notes
Part 1
1.	Ammonium	0.50	mgNH4/1	Consumer’s tap
2.	Chloride	250	mgCl/1	Supply point	Note 3
3.	Clostridium perfringens (including spores)	0	Number/100ml	Supply point	Note 4
4.	Coliform bacteria	0	Number/100ml	Consumer’s tap	Note 5
5.	Colony count	No abnormal change	Number/1ml at 22°C	Consumer’s tap, service reservoir and treatment works
6.	Colour	Acceptable to consumers and no abnormal change		Consumer’s tap
7.	Conductivity	2500	μS/cm at 20°C	Supply point	Note 6
8.	Hydrogen ion	9.5	pH value	Consumer’s tap	Notes 6 and 7
		6.5 (minimum)
9.	Odour	Acceptable to consumers and no abnormal change		Consumer’s tap
10.	Sulphate	250	mgSO4/l	Supply point	Note 3
11.	Taste	Acceptable to consumers and no abnormal change		Consumer’s tap
12.	Total organic carbon	No abnormal change	mgC/1	Supply point	Note 8
13.	Turbidity	1	NTU	Treatment works
Part 2
14.	Indicative dose	0.10	mSv	Supply point
15.	Radon	100	Bq/l	Supply point	Note 9
16.	Tritium	100	Bq/l	Supply point	Note 10

Textual Amendments

F2 Sch. 1 Table C and notes substituted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), reg. 1(1), sch. 2

In this Schedule—

F3 ...

[F4 “HAAs” means the sum of the following haloacetic acides: monochloro-, dichloro-, and trichloro-acetic acid, and mono- and dibromo-acetic acid,]

“NTU” means Nephelometric Turbidity Unit;

“PAH: Total” means the sum of the concentrations of the following polyaromatic hydrocarbons: benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene and indeno(1,2,3-cd)pyrene;

“Pesticide” means an organic insecticide, herbicide, fungicide, nematocide, acaricide, algicide, rodenticide, slimicide, F5 ... or related product (including a growth regulator), and includes [F6 their metabolites as defined in point (32) of Article 3 of Regulation (EC) No 1107/2009 of the European Parliament and of the Council that are relevant metabolites];

“Pesticides: Total” refers to the sum of the concentrations of each pesticide detected and quantified in the monitoring procedure;

[F7 “relevant metabolite” means a pesticide metabolite that has intrinsic properties comparable to those of the parent substance in terms of its pesticide target activity or that either itself or its transformation products generate a health risk for consumers,

Sum of PFAS” means the sum of the following perfluoroalkyl substances considered a concern as regards water intended for human consumption—

• Perfluorobutanoic acid,

• Perfluoropentanoic acid,

• Perfluorohexanoic acid,

• Perfluoroheptanoic acid,

• Perfluorooctanoic acid,

• Perfluorononanoic acid,

• Perfluorodecanoic acid,

• Perfluoroundecanoic acid,

• Perfluorododecanoic acid,

• Perfluorotridecanoic acid,

• Perfluorobutane sulfonic acid,

• Perfluoropentane sulfonic acid,

• Perfluorohexane sulfonic acid,

• Perfluoroheptane sulfonic acid,

• Perfluorooctane sulfonic acid,

• Perfluorononane sulfonic acid,

• Perfluorodecane sulfonic acid,

• Perfluoroundecane sulfonic acid,

• Perfluorododecane sulfonic acid,

• Perfluorotridecane sulfonic acid,]

“Tetrachloroethene and Trichloroethene” means the sum of the concentrations of tetrachloroethene and trichloroethene; and

“THM: Total” means the sum of the concentrations of the following trihalomethanes: chloroform, bromoform, dibromochloromethane and bromodichloromethane.

Textual Amendments

F3 Words in sch. 1 omitted (28.11.2015) by virtue of The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 16(c)

F4 Words in sch. 1 inserted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), regs. 1(1), 16(c)(i)

F5 Word in sch. 1 omitted (1.1.2023) by virtue of The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), regs. 1(1), 16(c)(ii)(aa)

F6 Words in sch. 1 inserted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), regs. 1(1), 16(c)(ii)(bb)

F7 Words in sch. 1 inserted (1.1.2023) by The Public Water Supplies (Scotland) Amendment Regulations 2022 (S.S.I. 2022/387), regs. 1(1), 16(c)(iii)