The Private Water Supplies (Scotland) Regulations 2006

(1)Item No.	(2)Parameters	(3)Trueness % of prescribed concentration or value or specification	(4)Precision % of prescribed concentration or value or specification	(5)Limit of detection % of prescribed concentration or value or specification
1.	Aluminium	10	10	10
2.	Ammonium	10	10	10
3.	Antimony	25	25	25
4.	Arsenic	10	10	10
5.	Benzene	25	25	25
6.	Benzo(a)pyrene	25	25	25
7.	Boron	10	10	10
8.	Bromate	25	25	25
9.	Cadmium	10	10	10
10.	Chloride	10	10	10
11.	Chromium	10	10	10
12.	Colour	10	10	10
13.	Conductivity	10	10	10
14.	Copper	10	10	10
15.	Cyanide(i)	10	10	10
16.	1,2–dichloroethane	25	25	25
17.	Fluoride	10	10	10
18.	Iron	10	10	10
19.	Lead	10	10	10
20.	Manganese	10	10	10
21.	Mercury	20	10	20
22.	Nickel	10	10	10
23.	Nitrate	10	10	10
24.	Nitrite	10	10	10
25.	Pesticides and related products(ii)	25	25	25
26.	Polycyclic aromatic hydrocarbons(iii)	25	25	25
27.	Selenium	10	10	10
28.	Sodium	10	10	10
29.	Sulphate	10	10	10
30.	Tetrachloroethene(iv)	25	25	10
31.	Tetrachloromethane	20	20	20
32.	Trichloroethene(iv)	25	25	10
33.	Trihalomethanes:Total(iii)	25	25	10
34.	Turbidity(v)	10	10	10
(1) Item No.	(2) Parameters	(3) Trueness % of prescribed concentration or value or specification	(4) Precision % of prescribed concentration or value or specification	(5) Limit of detection % of prescribed concentration or value or specification
---	---	---	---	---
Notes: The method of analysis should determine total cyanide in all forms. The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the prescribed value of 4NTU.	Notes: The method of analysis should determine total cyanide in all forms. The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the prescribed value of 4NTU.	Notes: The method of analysis should determine total cyanide in all forms. The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the prescribed value of 4NTU.	Notes: The method of analysis should determine total cyanide in all forms. The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned. The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B in Schedule 1. The performance characteristics apply to the prescribed value of 4NTU.
1.	Aluminium	10	10	10
2.	Ammonium	10	10	10
3.	Antimony	25	25	25
4.	Arsenic	10	10	10
5.	Benzene	25	25	25
6.	Benzo(a)pyrene	25	25	25
7.	Boron	10	10	10
8.	Bromate	25	25	25
9.	Cadmium	10	10	10
10.	Chloride	10	10	10
11.	Chromium	10	10	10
12.	Colour	10	10	10
13.	Conductivity	10	10	10
14.	Copper	10	10	10
15.	Cyanide(i)	10	10	10
16.	1,2–dichloroethane	25	25	25
17.	Fluoride	10	10	10
18.	Iron	10	10	10
19.	Lead	10	10	10
20.	Manganese	10	10	10
21.	Mercury	20	10	20
22.	Nickel	10	10	10
23.	Nitrate	10	10	10
24.	Nitrite	10	10	10
25.	Pesticides and related products(ii)	25	25	25
26.	Polycyclic aromatic hydrocarbons(iii)	25	25	25
27.	Selenium	10	10	10
28.	Sodium	10	10	10
29.	Sulphate	10	10	10
30.	Tetrachloroethene(iv)	25	25	10
31.	Tetrachloromethane	20	20	20
32.	Trichloroethene(iv)	25	25	10
33.	Trihalomethanes:Total(iii)	25	25	10
34.	Turbidity(v)	10	10	10

Signed

RHONA BRANKIN — Authorised to sign by the Scottish Ministers — 2006-04-19

Explanatory note

(This note is not part of the Regulations)

Footnotes

[^f00001]: 1980 c. 45. Sections 76F and 76J were inserted by the Water Act 1989 (c. 15), Schedule 22, paragraph 1. Section 101(1A) was inserted by the Natural Heritage (Scotland) Act 1991 (c. 28), Schedule 10, paragraph 9(5). Section 109(1) contains a definition of “prescribed” relevant to the exercise of the statutory powers under which these Regulations are made. The functions of the Secretary of State were transferred to the Scottish Ministers by virtue of section 53 of the Scotland Act 1998 (c. 46).

[^f00002]: 1972 c. 68. Section 2(2) was amended by the Scotland Act 1998 (c. 46), Schedule 8, paragraph 15(3). The functions conferred on the Minister of the Crown under section 2(2) of the European Communities Act 1972, insofar as within devolved competence, were transferred to the Scottish Ministers by virtue of section 53 of the Scotland Act 1998 (c. 46).

[^f00003]: S.I. 1992/575, as amended by S.I. 1998/1856. Regulation 23(b) was revoked by the Water Supply (Water Quality) (Scotland) Regulations 2001 (S.S.I. 2001/207, regulation 39(1)(c)).

[^f00004]: 2002 asp3, as amended by the Water Services etc. (Scotland) Act 2005 (asp 3).

[^f00005]: 1978 c. 29.

[^f00006]: 1994 c. 39.

[^f00007]: O.J. No. L 330, 5.12.98, p.32.

[^f00008]: 2000 c. 7.

[^f00009]: S.I. 1999/1540 as amended by S.S.I. 2000/62, 2003/139 and 2004/132.

[^f00010]: 1968 c. 67, as relevantly amended by S.I. 1994/3119 and S.I. 2005/50, regulation 25. “Medicinal product” and related expressions are defined in section 130 of that Act.

[^f00011]: O.J. No. L 330, 5.12.98.

[^f00012]: Section 76G was added by the Water Act 1989, Schedule 22, paragraph 1.

[^f00013]: Section 76G was added by the Water Act 1989, Schedule 2, paragraph 1.

[^f00014]: The office of the Drinking Water Quality Regulator for Scotland was established by Part 2 of the Water Industry (Scotland) Act 2002 (asp 3).

[^f00015]: 2002 (asp3), as amended by the Water Services etc. (Scotland) Act 2005 (asp 3).

[^f00016]: type=start slip=2006-06-01 time=1185374465711S.I. 1998/1856 .type=end slip=2006-06-01 time=1185374465711

[^f00017]: S.S.I. 2001/207. Regulation 39(1)(c) revokes regulation 23(b) of the Private Water Supplies (Scotland) Regulations 1992 (S.I. 1992/575).

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)Item	(2)Parameters	(3)Concentration or Value (maximum unless otherwise stated))	(4)Units of Measurement
1.	Aluminium	200	µgA1/1
2.	Colour	20	mg/l Pt/Co
3.	. . .	. . .	. . .
4.	Iron	200	µgFe/l
5.	Manganese	50	µgMn/l
6.	. . .	. . .	. . .
7.	Silver(i)	10	µg Ag/l
8.	Sodium	200	mgNa/l
9.	. . .	. . .	. . .
10.	Tetrachloromethane	3	µg/l
11.	Turbidity(ii)	4	NTU
12.	Zinc	5000	µg Zn/l

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.

Notes:

• (i) The water should not be aggressive.

• (ii) Remedial action is to be deemed justified on radiological protection grounds, without further consideration, where radon concentrations exceed 1,000 Bq/l.

• (iii) If the concentration of tritium exceeds this value, an analysis of the presence of other artificial radionuclides must be also carried out by Scottish Water.

Notes:

• (i) The water should not be aggressive.

Notes:

• (i) The sampling frequency (X) shall be determined as X = 4 + (3 for each 1000 m3/d and part thereof of the total volume).

• (ii) A supply zone is a geographically defined area within which water intended for human consumption comes from one or more sources and within which water quality may be considered as being approximately uniform.

• (iii) The volumes are calculated as averages taken over a calendar year or using consumption based on the number of inhabitants, assuming a water consumption rate of 200 l/day/capita.

• (iv) Values in (brackets) in columns (4) and (5) are reduced sampling frequencies which may be applied if–

• (aa) the values of the results obtained from samples taken during a period of at least two successive years are constant and significantly better than the limits laid down in Schedule 1; and

• (bb) no factor is likely to cause a deterioration of the quality of the water.

• (v) As far as possible, the number of samples should be distributed equally in time and location and should be representative of the quality of water consumed or available for consumption throughout the year.

• (vi) Necessary only when used as a flocculant. In all other cases the parameter will be sampled according to the frequency specified for audit monitoring (Table B of Schedule 2).

• (vii) Necessary only if the water originates from, or is influenced by, surface water. In all other cases the parameter will be sampled according to the frequency specified for audit monitoring (Table B of Schedule 2).

• (viii) Necessary only when chloramination is used as a disinfectant. In all other cases the parameter will be sampled according to the frequency specified for audit monitoring (Table B of Schedule 2).

Notes:

• (i) The sampling frequency (Y) shall be determined by–

Volume of water supplied each day (m³)	Y
> 1000 – �?� 10,000	1 + (1 for each 3,300 m³/d and part thereof of total volume)
> 10,000 – �?� 100,000	3 + (1 for each 10,000 m³/d and part thereof of total volume)
> 100,000	10 + (1 for each 25,000 m³/d and part thereof of total volume)

Parameters

1

Coliform bacteria

2

Conductivity

3

Enterococci

4

Escherichia coli (E. coli)

5

Hydrogen ion

6

Lead

7

Nitrate(i)

8

Odour – qualitative(ii)

9

Taste – qualitative(ii)

10

Turbidity

• (1) Where a monitoring local authority carries out an investigation in relation to a Type A supply for the purposes of regulation 26, it shall do so in accordance with the provisions of this Schedule and shall take into account the matters specified in Schedule 4.

• (2) Where a monitoring local authority considers that one or more of the parameters listed in the Table in this Schedule is not likely to be present in a Type A supply in its area in concentrations which could lead to the risk of a breach of the parametric value in respect of the parameters specified in Table B of Schedule 2, it shall undertake such investigations as are considers reasonable to satisfy itself–

• (a) that the circumstances referred to in column 3 of the Table in this Schedule in respect of that parameter do not exist; and

• (b) whether any of the conditions referred to in column 4 of the Table in this Schedule in respect of that parameter, apply.

• (3) Where a monitoring local authority is satisfied, as a result of its investigations under paragraph (2), that in respect of the supply, one or more of the parameters referred to in column 2 of the Table in this Schedule is not likely to be present in that supply in concentrations which could lead to the risk of a breach of the said parametric value in respect of such parameters, it may make a decision in accordance with regulation 26.

(1)Item No.	(2)Parameter	(3)Circumstances in which parameter is likely to be present	(4)Conditions to be satisfied before a decision may be made
(1)	Acrylamide	Residual acrylamide monomer occurs in polyacrylamide coagulants used in drinking water treatment.May also be used as grouting agents (polyacrylamide) in wells/borehole linings.	Coagulation is not practised.Grouting agents are present but that they do not have an acrylamide content.
(2)	Aluminium	Aluminium salts are widely used in water treatment as coagulants to reduce organic matter, colour, turbidity and micro organism levels.	Coagulation is not practised.
(3)	Antimony	Most common source of antinomy in drinking water appears to be dissolution from metal plumbing fittings.	If the monitoring local authority is satisfied that antimony is not present at or above 75% of PCV then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(4)	Arsenic	Arsenic is introduced into drinking water sources primarily through the dissolution of naturally occurring minerals and ores.Arsenic in drinking water is a significant source of health effects in some areas.Arsenic is considered to be a high-priority substance for screening in drinking water sources.Concentrations are highly dependent on the depth to which a well or borehole is sunk.	If the monitoring local authority is satisfied that arsenic is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(5)	Benzene	Benzene is used principally in the production of other organic chemicals.As benzene is present in petrol, vehicular emissions constitute the main source of the chemical in the environment.Benzene may be introduced into water by industrial effluents and atmospheric pollution.	Where the source of the supply comprises groundwater (well, spring, borehole or similar) the area in which the source is located must be an area devoid of industrial activity (current or historic) or hydrocarbon stores (current or historic) eg, underground petroleum tanks.Where the source of the supply comprises surface water, the area in which the source is located must be an area remote from areas of industrial activity (current or historic) or remote from areas of high vehicular activity.
(6)	Benzo(a)pyrene	See PAH	See PAH
(7)	Boron	Boron is found naturally in groundwater but its presence in surface water is frequently a consequence of the discharge of treated sewage effluent, in which it arises from its use in detergents, to surface water.	If the monitoring local authority is satisfied that Boron is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(8)	Bromate	Bromate is not normally found in water but may be formed during ozonation when the bromide ion is present in water.	No ozonation or chlorination to be undertaken on the supply.
		Under certain conditions bromate may also be found in concentrated hypochlorite solutions used to disinfect drinking water including electrolytic production of chlorine from sodium chloride
(9)	Cadmium	Cadmium is released into the environment in wastewater.Diffuse pollution is also caused by contamination from fertilizers and local air pollution.Contamination in drinking water may also be caused by impurities in the zinc of galvanised pipes and solders and some metal fittings.	If the monitoring local authority is satisfied that Cadmium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(10)	Chromium	Chromium is widely distributed in the Earth's crust. Soils and rocks may contain small amounts.	If the monitoring local authority is satisfied that Chromium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(11)	Copper	Copper concentrations in drinking water vary widely with the primary source most often being the corrosion of interior copper plumbing.Copper concentrations in treated water often increase during distribution, especially in systems with an acid pH or high carbonate waters with an alkaline pH.Consumption of standing or partially flushed water from a distribution system that includes copper pipes or fittings can considerably increase total daily copper exposure, especially for infants fed formula reconstituted with tap water.	If the monitoring local authority is satisfied that Copper is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(12)	Cyanide	Cyanides are occasionally found in drinking water primarily as a consequence of industrial contamination.	If the monitoring local authority is satisfied that Cyanide is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(13)	1,2 dichloroethane	1,2 dichloroethane is used mainly as an intermediate in the production of vinyl chloride and other chemicals and to a lesser extent as a solvent.It may enter surface waters via effluents from industries that manufacture or use the substance.It may also enter groundwater, where it persists for long periods, following disposal in waste sites.	If the monitoring local authority is satisfied that 1,2 dichloroethane is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(14)	Epichlorohydrin	Epichlorohydrin is used for the manufacture of glycerol, unmodified epoxy resins and water treatment resins.It is also found in some polyamine flocculants.	Coagulation is not practiced using polyamine flocculants.If ion exchange resins are present in the system then it should be sampled for against the prescribed frequency specified in Schedule 2.
(15)	Fluoride	Fluoride is present in a number of minerals.Fluoride may also be present in phosphate fertilizers.	If the monitoring local authority is satisfied that Fluoride is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(16)	Iron	Iron is found in natural fresh waters.Iron may also be present in drinking water as a result of iron coagulants or the corrosion of steel and cast iron pipes during water distribution.	If the monitoring local authority is satisfied that Iron is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(17)	Lead	Lead is rarely present in tap water as a result of its dissolution from natural sources.The presence of lead is primarily from household plumbing systems containing lead in pipes, solder, fittings or the service connections to homes.	If the monitoring local authority is satisfied that Lead is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(18)	Manganese	Manganese is naturally occurring in many surface and groundwater sources, particularly in anaerobic or low oxidation conditions.Manganese greensands are used in some locations for potable water treatment.	If the monitoring local authority is satisfied that Manganese is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(19)	Mercury	Mercury can be used in the electrolytic production of chlorine.	If electrolytic production of chlorine is used as part of the treatment process the supply should be sampled as specified in Schedule 2;
			if electrolytic production of chlorine is not used as part of the treatment process, and if the monitoring local authority is satisfied that mercury is not present at or above 75% of PCV, then an exemption under regulation 26 may be granted, otherwise it should be sampled for at the frequency specified in Schedule 2.
(20)	Nickel	Nickel may be present as a result of plumbing fittings eg from nickel- or chromium-plated taps.	If the monitoring local authority is satisfied that Nickel is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(21)	Nitrate	Nitrate is used mainly in inorganic fertilisers. The nitrate concentration in groundwater and surface water is normally low but can reach high levels as a result of leaching or runoff from agricultural land or contamination from human or animal wastes as a consequence of oxidation of ammonia or similar sources.	If the supply is in an area where agricultural fertilisers are used then the supply should be sampled as specified in Schedule 2;if the supply is in an area where agricultural fertilisers are not used, and if the monitoring local authority is satisfied that nitrate is not present at or above 75% of PCV, then an exemption under regulation 26 may be granted, otherwise it should be sampled for at the frequency specified in Schedule 2.
(22)	Nitrite	Nitrite is formed during the decomposition of organic matter but high concentrations are usually associated with poor control of chloramination or chlorine disinfection of water containing significant amounts of ammonium ions.	If the monitoring local authority is satisfied that Nitrite is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(24)	Pesticides	See definition of “pesticides and related products” in regulation 2(1).The range of pesticides and related products that may be being used in any one area should be assessed on an individual supply basis.	If the monitoring local authority is satisfied that Pesticides are not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise they should be sampled for at the frequency specified in Schedule 2.
(25)	Pesticides – Total	“Pesticides – Total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring procedure.	See Pesticides.
(26)	Polycyclic Aromatic Hydrocarbons (PAH)	The main source of PAH contamination in drinking water is usually the coal-tar coating of drinking water distribution pipes used to protect the pipes from corrosion.	If the monitoring local authority is satisfied that PAH are not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise they should be sampled for at the frequency specified in Schedule 2.
(26A)	Radon	The supply is located in an area which puts it at high risk of exceeding the prescribed concentration or value for radon (at the point referred to in regulation 7(5)) and the supply is not open to atmospheric pressure before that point.	The monitoring local authority for the supply in question is in receipt of a notice under regulation 24(1) which specifies, for an area in which that supply is located, that the condition in regulation 24(2)(za) is satisfied (and the notice applies to that extent).
(27)	Selenium	Selenium is present in the Earth's crust, often in association with sulphur-containing minerals and hence the concentration in drinking water will vary with local geology and geography.	If the monitoring local authority is satisfied that Selenium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(28)	Silver	Silver may be used in some water treatment devices where it is used for disinfection purposes.	If the monitoring local authority is satisfied that Silver is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(29)	Sodium	Concentrations in potable water are typically low but some water softeners can add significantly to the sodium content of drinking water.	If the monitoring local authority is satisfied that Sodium is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(30)	Sulphate	Sulphates occur naturally in numerous minerals and are used commercially but the highest levels found in groundwaters are from natural sources.Sulphates may occur in surface waters that have received industrial discharges.	If the monitoring local authority is satisfied that Sulphate is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(31)	Tetrachloroethene and Trichloroethene	These chemicals are used primarily as solvents in dry cleaning industries and as degreasing solvents.	If the monitoring local authority is satisfied that Tetrachloroethene and Trichloroethene are not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise they should be sampled for at the frequency specified in Schedule 2.
(32)	Tetrachloromethane	Chlorinated organic compound (also known as carbon tetrachloride) that is a very efficient solvent for fats and greases, and was at one time the main constituent of household dry-cleaning fluids and of fire extinguishers used with electrical and petrol fires.	If the monitoring local authority is satisfied that Tetrachloromethane is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(33)	Total indicative dose	Routine monitoring of the supply indicates that the total indicative dose is not likely to be well below the prescribed concentration or value for that parameter.	The monitoring local authority for the supply in question is in receipt of a notice under regulation 24(1) which specifies, for an area in which that supply is located, that the condition in regulation 24(2)(a) is satisfied (and the notice applies to that extent)
(34)	Trihalomethanes – Total	These compounds are generated principally as by-products of the chlorination of drinking water, being formed from naturally occurring organic compounds.	No chlorination is undertaken on the supply.
(35)	Tritium	Routine monitoring of the supply indicates that tritium is not likely to be well below the prescribed concentration or value for that parameter.	The monitoring local authority for the supply in question is in receipt of a notice under regulation 24(1) which specifies, for an area in which that supply is located, that the condition in regulation 24(2)(b) is satisfied (and the notice applies to that extent).
(36)	Vinyl chloride	Vinyl chloride is used primarily for the production of PVC.When unplasticised PVC is in contact with water it is possible for the vinyl chloride monomer to be released into the water.Unplasticised PVC pipes should not be used for drinking water supplies. This is controlled by product specification.	Unplasticised PVC pipes not present.If the monitoring local authority is satisfied that Vinyl chloride is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(37)	Zinc	Traces of zinc occur naturally in many water sources but significant concentrations may occur as a consequence of the use of brass fittings and galvanised iron pipes.	If the monitoring local authority is satisfied that Zinc is not present at or above 75% of PCV, then an exemption may be granted under regulation 26, otherwise it should be sampled for at the frequency specified in Schedule 2.
(1)Parameter	(2)Method
---	---
Clostridium perfringens (including spores)	Membrane filtration followed by anaerobic incubation of the membrane on m–CP agar(i) at 44 ± 1°C for 21 ± 3 hours. Count opaque yellow colonies that turn pink or red after exposure to ammonium hydroxide vapours for 20 to 30 seconds.
Coliform bacteria	ISO 9308–1
Colony count 22°C – enumeration of culturable micro-organisms	prEN ISO 6222
Enterococci	ISO 7899–2
Escherichia coli (E.coli)	ISO 9308–1

• (i) The composition of m–CP agar is:

• Basal mediumTryptose30gYeast extract20gSucrose5gL–cysteine1gMgSO4 . 7H2O0.1gBromocresol purple40mgAgar15gWater1,000ml

• Dissolve the ingredients of the basal medium, adjust pH to 7.6 and autoclave at 121°C for 15 minutes. Allow the medium to cool and add:D–cycloserine400mgPolymyxine–B–sulphate25mgIndoxyl–β-D-glucosideto be dissolved in 8ml sterile water before addition60mgFilter – sterilised 0.5% phenolphthalein disphosphate solution20mlFilter – sterilised 4.5% FeC13 . 6H2O2ml

Notes:

• (ii) The method of analysis should determine total cyanide in all forms.

• (iii) The performance characteristics apply to each individual pesticide and will depend on the pesticide concerned.

• (iv) The performance characteristics apply to the individual substances specified at 25% of the parametric value in Table B in Schedule 1.

• (v) The performance characteristics apply to the individual substances specified at 50% of the parametric value in Table B in Schedule 1.

• (vi) The performance characteristics apply to the prescribed value of 4NTU.

Editorial notes

[^c15355301]: 1980 c. 45. Sections 76F and 76J were inserted by the Water Act 1989 (c. 15), Schedule 22, paragraph 1. Section 101(1A) was inserted by the Natural Heritage (Scotland) Act 1991 (c. 28), Schedule 10, paragraph 9(5). Section 109(1) contains a definition of “prescribed” relevant to the exercise of the statutory powers under which these Regulations are made. The functions of the Secretary of State were transferred to the Scottish Ministers by virtue of section 53 of the Scotland Act 1998 (c. 46).

[^c15355311]: 1972 c. 68. Section 2(2) was amended by the Scotland Act 1998 (c. 46), Schedule 8, paragraph 15(3). The functions conferred on the Minister of the Crown under section 2(2) of the European Communities Act 1972, insofar as within devolved competence, were transferred to the Scottish Ministers by virtue of section 53 of the Scotland Act 1998 (c. 46).

[^c15355321]: S.I. 1992/575, as amended by S.I. 1998/1856. Regulation 23(b) was revoked by the Water Supply (Water Quality) (Scotland) Regulations 2001 (S.S.I. 2001/207, regulation 39(1)(c)).

[^c15355331]: 2002 asp3, as amended by the Water Services etc. (Scotland) Act 2005 (asp 3).

[^c15355341]: 1978 c. 29.

[^c15355351]: 1994 c. 39.

[^c15355361]: O.J. No. L 330, 5.12.98, p.32.

[^c15355371]: 2000 c. 7.

[^c15355381]: S.I. 1999/1540 as amended by S.S.I. 2000/62, 2003/139 and 2004/132.

[^c15355391]: 1968 c. 67, as relevantly amended by S.I. 1994/3119 and S.I. 2005/50, regulation 25. “Medicinal product” and related expressions are defined in section 130 of that Act.

[^c15355421]: Section 76G was added by the Water Act 1989, Schedule 2, paragraph 1.

[^c15355431]: The office of the Drinking Water Quality Regulator for Scotland was established by Part 2 of the Water Industry (Scotland) Act 2002 (asp 3).

[^c15355441]: 2002 (asp3), as amended by the Water Services etc. (Scotland) Act 2005 (asp 3).

[^c15355451]: S.I. 1998/1856.

[^key-04ce1f855fdb595963dcef6a4776fb9e]: Reg. 5A inserted (20.4.2010) by The Water Quality (Scotland) Regulations 2010 (S.S.I. 2010/95), regs. 1(1), 15

[^key-3acb8f8d51821fe9cd03be64a0182fb1]: Reg. 34(1)(ia) inserted (20.4.2010) by The Water Quality (Scotland) Regulations 2010 (S.S.I. 2010/95), regs. 1(1), 20

[^key-e921b6a52a2b177d9d7bde715c848dfc]: Reg. 37(1)(c) revoked (1.1.2015) by The Public Water Supplies (Scotland) Regulations 2014 (S.S.I. 2014/364), regs. 1(1), 50(2)(b) (with reg. 1(3)(4))

[^key-e2bc222b1889a3e0dcfd69e3f1c6ef02]: Sch. 1 Table B Pt. 2 entry 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), 8(a)(i)

[^key-91fec9160d309c18a2ee39e8250663e7]: Sch. 1 Table B Pt. 2 entry 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), 8(a)(ii)

[^key-a9f8556a520cabe3ca3b0ceb0e969844]: Sch. 1 Table B Pt. 2 entry 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), 8(a)(iii)

[^key-ecc2596bbd10fdc2a7310a66243cc8d1]: Words in Sch. 1 Table C inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(i)

[^key-662e887b39e78213569f3e8c9f468eb1]: Sch. 1 Table C entry inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(ii)

[^key-91fc68142b08b228804568566d49e5ef]: Sch. 1 Table C entry inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(iii)

[^key-96692b40e5aa21c41a6c4be3eef2acd7]: Sch. 1 Table C entry inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(iv)

[^key-8ba1715060ee05003af85e950042de26]: Sch. 1 Table C entry inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(v)

[^key-9b6d88754088bfec7b8997ecaedcc277]: Words in Sch. 1 Table C 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), 8(b)(vi)

[^key-e5e1c741e3306e2a6c3dbc6e0db63178]: Word in Sch. 1 Table C inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(b)(vii)

[^key-9f7a4d0da6e9c3800cf76a29356d677f]: Sch. 1 Table C Note (ii)(iii) substituted for Sch. 1 Table C Note (ii) (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 8(c)

[^key-722c8bbaa494e09ec25c20151736ce32]: Reg. 5B inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 4

[^key-d2f8e17f70430f63b068094b55ac76c2]: Words in reg. 2(1) inserted (28.11.2015) by The Private and Public Water Supplies (Miscellaneous Amendments) (Scotland) Regulations 2015 (S.S.I. 2015/346), regs. 1(1), 3

[^key-7ac4a7794d2d4252b7a39606628aec57]: Sch. 2 Table A omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xi) (with reg. 2)

[^key-faebe0368014dad0cf41a9b6ad6d5ea8]: Sch. 2 Table B omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xi) (with reg. 2)

[^key-5b39fa38a9e002d0eade692b41b7779c]: Sch. 2A omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xii) (with reg. 2)

[^key-adde1881ea0b35a7e8f87ca6b8438bdf]: Sch. 3 omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xiii) (with reg. 2)

[^key-3da47962a4d8bbe8c7b48935d6fbd1b4]: Sch. 5A omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xv) (with reg. 2)

[^key-f6984ecfe12fa68e9899b9e5b4954242]: Words in Sch. 4(1) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(xiv) (with reg. 2)

[^key-dc8d2c59de3048461f4574ec37ea6edc]: Regs. 8-26 omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(iii) (with reg. 2)

[^key-20f79bc04ccc77b56024d83f9330716a]: Reg. 3(3) inserted (27.10.2017) by The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(a) (with reg. 2)

[^key-3afe816432617e580127414b29e0fbb4]: Reg. 6 omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(i) (with reg. 2)

[^key-dbf9e48f9453e9b0657095a1a27643fb]: Reg. 7(1)(a) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ii) (with reg. 2)

[^key-e8c1aaaa5f0ec1fa9d10e9f253fd122e]: Reg. 7(2) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ii) (with reg. 2)

[^key-d92782908a11b588d2628b0960122e06]: Word in reg. 7(4) substituted (27.10.2017) by The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(b) (with reg. 2)

[^key-f9fcc58b7cb09bada3f9f64ba2fb5204]: Reg. 7(4)(b) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ii) (with reg. 2)

[^key-02b2546b4c3dd1a0307d6d740f72930b]: Reg. 7(5) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ii) (with reg. 2)

[^key-16be683565137ea61a8ab35c9128bf26]: Word in reg. 29(3) substituted (27.10.2017) by The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(c) (with reg. 2)

[^key-8ff2f5fc98c07758e303f7a737d94696]: Words in reg. 31(2)(a) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(iv) (with reg. 2)

[^key-be684285b1f27661215c519c758b7a03]: Reg. 32(b) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(v) (with reg. 2)

[^key-5a93aad5c219f86cb8e97d16dc4803ca]: Reg. 33(1)(a) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(vi) (with reg. 2)

[^key-a0e07df6fc016265a6180b4567c02720]: Words in reg. 33(2) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(vii) (with reg. 2)

[^key-e75d58012fe3038d9ab352873e172a12]: Words in reg. 33(3) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(viii) (with reg. 2)

[^key-32c9503cd03f68813e06070c9ef4c197]: Reg. 34(1)(a)(i) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ix) (with reg. 2)

[^key-804d1ee6dc62053d7c4deabc405aa198]: Reg. 34(1)(a)(ii) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ix) (with reg. 2)

[^key-2d2bc5a0db31f4fafa12d3af6ce81b21]: Reg. 34(1)(g) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ix) (with reg. 2)

[^key-22c4dbd3cc67f4e5af560b49a83258bf]: Reg. 34(1)(l) omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(ix) (with reg. 2)

[^key-0e13dda8bb5a9717056df7d582392090]: Reg. 36 omitted (27.10.2017) by virtue of The Water Intended for Human Consumption (Private Supplies) (Scotland) Regulations 2017 (S.S.I. 2017/282), reg. 1(1), Sch. 10 para. 2(d)(x) (with reg. 2)

Duty of relevant person in relation to disinfection

5A

Where a relevant person disinfects a private water supply for human consumption purposes, the relevant person must—

• (a) where necessary, subject the water to sufficient preliminary treatment to prepare the water for disinfection; and

• (b) design, operate and maintain the disinfection process so as to keep disinfection by-products as low as possible without compromising the performance of the disinfection process.

Additional notification of consumers

18A

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Application and introduction of substances and products

5B

Where a relevant person, in the preparation or distribution of a private water supply for human consumption purposes, applies any substance or product to, or introduces any substance or product into, the water which is to be supplied for those purposes, the person must take all measures necessary to ensure that, in doing so, the water supplied does not, at its point of use, contain the substance or product, or any impurity associated with the substance or product, at a concentration or value which would make the water unwholesome.

Monitoring: radon, total indicative dose and tritium

SCHEDULE 2A — MONITORING OF RADIOACTIVE SUBSTANCES

General principles and monitoring frequencies

1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Radon

2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tritium

3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Total indicative dose

4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Water treatment

5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Averaging

6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SCHEDULE 5A — MONITORING FOR TOTAL INDICATIVE DOSE AND ANALYTICAL PERFORMANCE CHARACTERISTICS

Monitoring for compliance with the total indicative dose

1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screening for certain radionuclides or for an individual radionuclide

2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Screening for gross alpha activity and gross beta activity

3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calculation of the total indicative dose

4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance characteristics and methods of analysis

5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

• (1) When undertaking or reviewing and updating a risk assessment for the purposes of regulations ... 27, a monitoring local authority shall do so in accordance with the provisions of this Schedule.

• (2) A risk assessment shall comprise the following–

• (a) documentation on and a description of the private water supply, including the catchment from which the supply draws water;

• (b) a hazard assessment and risk characterisation;

• (c) an identification of the measures by which risks may be controlled; and

• (d) establishment of verification procedures,

and for the purposes of this paragraph, “hazard” means a biological, chemical, physical or radiological agent that has the potential to cause harm or danger to human health; and “risk” means the likelihood of identified hazards causing harm in exposed populations in a specified time, including the magnitude of that harm and/or the consequences of such harm.

• (3) In respect of a private water supply which comprises, either alone or in any combination thereof, catchments, surface water or ground water, the risk assessment shall include provision in relation to the relevant matters specified in Table A of this Schedule.

• (4) In respect of a private water supply which receives treatment, including treatment at source and at any point thereafter, the risk assessment shall make provision in relation to the relevant matters specified in Table B of this Schedule.

• (5) In respect of a private water supply which comprises intermediate tanks and distribution, the risk assessment shall include provision in relation to the relevant matters specified in Table C of this Schedule.