The Private Water Supplies (Scotland) Regulations 2006

Regulations 2(1), 7, 8, 17-26 and 28

SCHEDULE 1 PRESCRIBED CONCENTRATIONS AND VALUES

Table A Microbiological parameters

Part I: Directive requirements

(1) Item	(2) Parameters	(3) Concentration or Value (maximum)	(4) Units of Measurement
1.	Enterococci	0	number/100ml
2.	Escherichia coli (E. coli)	0	number/100ml

Part II: National requirements

(1) Item	(2) Parameters	(3) Concentration or Value (maximum)	(4) Units of Measurement
1.	Coliform bacteria	0	number/100ml

Table B Chemical parameters

Part I: Directive requirements

(1) Item	(2) Parameters	(3) Concentration or Value (maximum)	(4) Units of Measurement
Notes: (i) The parametric value 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. This is controlled by product specification. (ii) See the definition of “pesticides and related products” in regulation 2(1). The parametric value applies to each individual pesticide. (iii) “Pesticides: Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure. (iv) “PAH” means Polycyclic Aromatic Hydrocarbons, the specified compounds being: benzo(b)fluoranthene benzo(k)fluoranthene benzo(ghi)perylene indeno(1,2,3–cd)pyrene. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (v) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process. (vi) “THM: Total” means total Trihalomethanes, the specified compounds being: chloroform bromoform dibromochloromethane bromodichloromethane. The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
1.	Acrylamide(i)	0.10	µg/1
2.	Antimony	5.0	µgSb/l
3.	Arsenic	10	µgAs/l
4.	Benzene	1.0	µg/l
5.	Benzo(a)pyrene	0.010	µg/l
6.	Boron	1.0	mgB/l
7.	Bromate	10	µgBrO3/l
8.	Cadmium	5.0	µgCd/l
9.	Chromium	50	µgCr/l
10.	Copper	2.0	mg Cu/l
11.	Cyanide	50	µgCN/l
12.	1,2 dichloroethane	3.0	µg/l
13.	Epichlorohydrin(i)	0.10	µg/l
14.	Fluoride	1.5	mg F/l
15.	Lead	(a) 25, from 3/7/06 until 24/12/13	µgPb/l
		(b) 10, from 25/12/13	µgPb/l
16.	Mercury	1.0	µgHg/l
17.	Nickel	20	µgNi/l
18.	Nitrate	50	mgNO3/l
19.	Nitrite	0.50	mgNO2/l
20.	Pesticides(ii)–
	Aldrin	0.030	µg/l
	Dieldrin	0.030	µg/l
	Heptachlor	0.030	µg/l
	Heptachlor epoxide	0.030	µg/l
	other pesticides	0.10	µg/l
21.	Pesticides: Total(iii)	0.50	µg/l
22.	PAH(iv)	0.10	µg/l
23.	Selenium	10	µgSe/l
24.	Tetrachloroethene & Trichloroethene(v)	10	µg/l
25.	THM: Total(vi)	100	µg/l
26.	Vinyl chloride(i)	0.50	µg/l

Part II: National requirements

(1) Item	(2) Parameters	(3) Concentration or Value (maximum unless otherwise stated))	(4) Units of Measurement
Notes: (i) If Silver is used in a water treatment process, 80 may be substituted for 10. (ii) Every effort should be made to achieve 1 NTU whenever possible.
1.	Aluminium	200	µgA1/1
2.	Colour	20	mg/l Pt/Co
3.	Hydrogen ion	9.5	pH value
		6.5 (minimum)
4.	Iron	200	µgFe/l
5.	Manganese	50	µgMn/l
6.	Odour	3 at 25ºC	Dilution number
7.	Silver(i)	10	µg Ag/l
8.	Sodium	200	mgNa/l
9.	Taste	3 at 25ºC	Dilution number
10.	Tetrachloromethane	3	µg/l
11.	Turbidity(ii)	4	NTU
12.	Zinc	5000	µg Zn/l

Table C Indicator parameters

Directive requirements

(1) Item	(2) Parameters	(3) Concentration or Value (maximum) or State	(4) Units of Measurement
Notes: (i) The water should not be aggressive. (ii) Excluding tritium, potassium – 40, radon and radon decay products.
1.	Ammonium	0.50	mgNH4/l
2.	Chloride(i)	250	mgC1/1
3.	Clostridium perfringens (including spores)	0	Number/100 ml
4.	Coliform bacteria	0	Number/100 ml
5.	Colony count	No abnormal change	Number/1 ml at 22°C
6.	Conductivity(i)	2500	µS/cm at 20°C
7.	Sulphate(i)	250	mgSO4/l
8.	Total indicative dose (for radioactivity)(ii)	0.10	mSv/year
9.	Total organic carbon (TOC)	No abnormal change	mgC/l
10.	Tritium (for radioactivity)	100	Bq/l

Table D Microbiological and Chemical Parameters: Type B Supplies

National Requirements

(1) Item	(2) Parameters	(3) Concentration or Value (maximum)	(4) Units of Measurement
Notes: (i) The water should not be aggressive.
1.	Coliform Bacteria	0	number/100ml
2.	Conductivity (i)	2500	µS/cm at 20°C
3.	Enterococci	0	number/100ml
4.	Escherichia coli (E.coli)	0	number/100ml
5.	Hydrogen ion	9.5 6.5 (minimum)	pH value
6.	Lead	(a) 25, from 3/7/06 until 24/12/13 (b) 10, from 25/12/13	µgPb/l
7.	Nitrate	50	mgNO3/l
8.	Odour-qualitative	-	-
9.	Taste-qualitative	-	-
10.	Turbidity	4	NTU