The Private Water Supplies Regulations 1991

SCHEDULE 1 EXERCISE OF POWERS

1.  The powers conferred by sections 67 and 213(2) of the Water Industry Act 1991 are exercised–

(a) to the extent that they relate to the matters specified in section 67(2)(a) to (d), by the Secretary of State for the Environment and the Secretary of State for Wales jointly;

(b) to the extent that they relate to the matters specified in section 67(2)(e), by the Secretary of State for the Environment in relation to water supplied in England and by the Secretary of State for Wales in relation to water supplied in Wales; and

(c) to the extent that they relate to the matter specified in section 67(2)(f), by the Secretary of State for the Environment in relation to local authorities exercising functions in England and by the Secretary of State for Wales in relation to local authorities exercising functions in Wales.

2.  The powers conferred by section 77(3) and (4) of that Act (and section 213(2) to the extent it relates to those subsections) are exercised by the Secretary of State for the Environment in relation to local authorities exercising functions in England and by the Secretary of State for Wales in relation to local authorities exercising functions in Wales.

Regulation 2(1)

SCHEDULE 2 PRESCRIBED CONCENTRATIONS OR VALUES

Table A

Item	Parameters	Units of Measurement	Concentration or Value (maximum unless otherwise stated)
Note: (i) If silver is used in a water treatment process, 80 may be substituted for 10.
1.	Colour	mg/1 Pt/Co scale	20
2.	Turbidity (including suspended solids)	Formazin turbidity units	4
3.	Odour (including hydrogen sulphide)	Dilution number	3 at 35°C
4.	Taste	Dilution number	3 at 35°C
5.	Temperature	°C	25
6.	Hydrogen ion	pH value	9.5 5.5 (minimum)
7.	Sulphate	mg SO4/1	250
8.	Magnesium	mg Mg/1	50
9.	Sodium	mg Na/1	150
10.	Potassium	mg K/1	12
11.	Dry residues	mg/1	1500 (after drying at 180°C)
12.	Nitrate	mg NO3/1	50
13.	Nitrite	mg NO2/1	0.1
14.	Ammonium (ammonia and ammonium ions)	mg NH4/1	0.5
15.	Kjeldahl nigrogen	mg N/1	1
16.	Oxidisability (permangantate value)	mg O2/1	1
17.	Total organic carbon	mg C/1	No significant increase over that normally observed
18.	Dissolved or emulsified hydrocarbons (after extraction with petroleum ether); mineral oils	μg/1	10
19.	Phenols	μg C6H5OH/1	0.5
20.	Surfactants	μg/1 (as lauryl sulphate)	200
21.	Aluminium	μg Al/1	200
22.	Iron	μg Fe/1	200
23.	Manganese	μg Mn/1	50
24.	Copper	μg Cu/1	3000
25.	Zinc	μg Zn/1	5000
26.	Phosphorus	μg P/1	2200
27.	Fluoride	μg F/1	1500
28.	Silver	μg Ag/1	10(i)

Table B

Item	Parameters	Units of Measurement	Maximum Concentration
Note: (i) The sum of the detected concentrations of individual substances. (ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.
1.	Arsenic	μg As/1	50
2.	Cadmium	μg Cd/1	5
3.	Cyanide	μg CN/1	50
4.	Chromium	μg Cr/1	50
5.	Mercury	μg Hg/1	1
6.	Nickel	μg Ni/1	50
7.	Lead	μg Pb/1	50
8.	Antimony	μg Sb/1	10
9.	Selenium	μg Se/1	10
10.	Pesticides and related products: (a) individual substances	μg/1	0.1
	(b) total substances(i)	μg/1	0.5
11.	Polycyclic aromatic hydrocarbons(ii)	μg/1	0.2

Table C

Item	Parameters	Units of Measurement	Maximum Concentration
Note: (i) Analysis by multiple tube method.
1.	Total coliforms	number/100 ml	0
2.	Faccal coliforms	number/100 ml	0
3.	Faccal streptococci	number/100 ml	0
4.	Sulphite-reducing clostridia	number/20 ml	≤1(i)
5.	Colony counts	number/1 ml at 22°C or 37°C	No significant increase over that normally observed

Table D(i)

Item	Parameters	Units of Measurement	Maximum Concentration or Value
Note: (i) See regulation 3(3)(d).
1.	Conductivity	μS/cm	1500 at 20°C
2.	Chloride	mg Cl/1	400
3.	Calcium	mg Ca/1	250
4.	Substances extractable in chloroform	mg/1 dry residue	1
5.	Boron	μg B/1	2000
6.	Barium	μg Ba/1	1000
7.	Benzo 3,4 pyrene	μg/1	10
8.	Tetrachloromethane	μg/1	3
9.	Trichloroethene	μg/1	30
10.	Tetrachlorothene	μg/1	10

Table E

Item	Parameters	Units of Measurement	Minimum Concentration(i)
Note: (i) See regulation 3(4).
1.	Total hardness	mg Ca/1	60
2.	Alkalinity	mg HCO3/1	30

Regulations 14 to 16

SCHEDULE 3 SAMPLING FREQUENCIES FOR CLASSES A, B, 1 AND 2

	Sampling Frequency (number per annum)			Sampling Frequency (number per annum)
Parameter	Class A and Class 1			Class B and Class 2
	Reduced	Standard	Increased	Reduced	Standard	Increased
(1)	(2)	(3)	(4)	(5)	(6)	(7)
Notes: (i) Increased or reduced sampling where permitted or required may be confined to the substance in question. (ii) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.
PART I:
Conductivity	6	12	24	4	6	12
Hydrogen ion	6	12	24	4	6	12
Odour (qualitative)	6	12	24	4	6	12
Taste (qualitative)	6	12	24	4	6	12
PART II:
Odour (quantitative)	—	4	24	—	4	12
Taste (quantitative)	—	4	24	—	4	12
Turbidity	—	4	24	—	4	12
Temperature	—	4	24	—	4	12
Nitrate	—	4	24	—	4	12
Nitrite	—	4	24	—	4	12
Ammonium	—	4	24	—	4	12
Iron	—	4	24	—	4	12
Aluminium	—	4	24	—	4	12
Manganese	—	4	24	—	4	12
Colour	—	4	24	—	4	12
PART III:
Trihalomethanes	1	4	12	1	4	12
Tetrachloromethanes	1	4	12	1	4	12
Trichloroethene	1	4	12	1	4	12
tetrachloroethene	1	4	12	1	4	12
Copper	1	4	12	1	4	12
Lead	1	4	12	1	4	12
Zinc	1	4	12	1	4	12
Pesticides and related prodcts(i)	1	4	12	1	4	12
Polycyclic aromatic hydrocarbons(ii)	1	4	12	1	4	12
PART IV:
Chloride	—	1	12	—	1	12
Sulphate	—	1	12	—	1	12
Calcium	—	1	12	—	1	12
Magnesium	—	1	12	—	1	12
Sodium	—	1	12	—	1	12
Potassium	—	1	12	—	1	12
Dry residues	—	1	12	—	1	12
Ozidizability (permanganatge value)	—	1	12	—	1	12
Total organic carbon	—	1	12	—	1	12
Boron	—	1	12	—	1	12
Surfactants	—	1	12	—	1	12
Phosphorus	—	1	12	—	1	12
Fluoride	—	1	12	—	1	12
Barium	—	1	12	—	1	12
Silver	—	1	12	—	1	12
Arsenic	—	1	12	—	1	12
Cadmium	—	1	12	—	1	12
Cyanide	—	1	12	—	1	12
Chromium	—	1	12	—	1	12
Mercury	—	1	12	—	1	12
Nickel	—	1	12	—	1	12
Antimony	—	1	12	—	1	12
Selenium	—	1	12	—	1	12
Total Hardness	—	1	12	—	1	12
Alkalinity	—	1	12	—	1	12
PART V:
Total coliforms	—	24	—	—	12	24
Faecal coliforms	—	24	—	—	12	24
Residual disinfectant	—	24	—	—	12	24
Colony counts	—	24	—	—	12	24

Regulation 18

SCHEDULE 4 SAMPLING FOR CLASSES C, D, E, 3, 4 AND 5

PART I FREQUENCY

	Number of Samples(1)
Class of Supply	Basic Parameters(2)	Additional Parameters(3)	Coliform Parameters(4)
Notes: (1) Samples are to be taken each year except in the case of class E supplies (see note 5). If more than one sample is required, the samples must be taken on separate occasions. (2) The basic parameters are listed in column (1) of Part II of this Schedule. (3) The additional parameters are listed in column (2) of Part II of this Schedule. The local authority must sample for any additional parameters which they consider should be taken because of the characteristics of the locality or of the supply’s distribution system. (4) The coliform parameters are total coliforms and faecal coliforms. Sampling for coliform parameters is additional to the coliform sampling carried out as part of sampling for basic parameters and must be carried out on separate occasions. (5) Class E supplies are to be sampled once for basic and additional parameters before 31st December 1994 unless– (a) they have been sampled for those parameters during 1990 or 1991; and (b) the local authority have reasonable grounds for believing that no change has occurred or is likely to occur which may cause the quality of the supply to deteriorate. From 1st January 1995 all class E supplies are to be sampled once every 5 years. (6) The sampling frequency should be halved if the premises served by the supply are used for not more than six months in the year. (7) In 1992, or in the first year in which the supply is used as a class 3 supply, 2 samples must be taken in the first two months of the year and 3 in the remainder of that year.
C	1	1	1
D	1	1	—
E(5)	1	1	—
3	2(6)	2(6)	4(6) (7)
4	2(6)	1(6)	—
5	—	—	1

PART II PARAMETERS

Basic parameters	Additional Parameters
(1)	(2)
Notes: (1) Samples need not be analysed for lead if the local authority are satisfied that lead pipework or solder is not present in the plumbing of the property or that naturally occurring lead is not present in the water. (2) Samples need not be analysed for nitrate if the local authority are satisfied that nitrate levels in the locality concerned are below 25 mg NO3/l. (3) Samples should not be assessed qualitatively for taste if the person taking the samples has any reason to suspect that the water may give rise to a health hazard. (4) The sum of the detected concentrations of fluoranthene, benzo 3.4 fluoranthene, benzo 11.12 fluoranthene, benzo 3.4 pyrene, benzo 1.12 perylene and indeno (1,2,3-cd) pyrene.
Hydrogen ion	Odour (quantitative)	Zinc	Fluoride
Conductivity	Taste (quantitative)	Polycyclic aromatic hydrocarbons(4)	Barium
Total coliforms	Temperature		Silver
Faecal coliforms	Nitric	Chloride	Arsenic
Lead (1)	Ammonium	Sulphate	Cadmium
Nitrate(2)	Iron	Calcium	Cyanide
Odour (qualitative)	Aluminium	Magnesium	Chromium
Taste (qualitative)(3)	Manganese	Sodium	Mercury
Turbidity	Colour	Potassium	Nickel
	Trihalomethanes	Dry residues	Antimony
	Tetrachloromethane	Oxidazability (permanent value)	Selenium
	Trichloroethene		Total hardness
	Tetrachloroethene	Totl organic carbon	Alkalinity
	Copper	Boron	Residual disinfectant
		Surfaciants	Colony counts
		Phosphorus

Regulation 20(1)(b)

SCHEDULE 5

MAXIMUM CHARGES FOR SAMPLING AND ANALYSIS

Class of supply	Parameters sampled and analysed		Maximum charge
A, B, 1, 2	Schedule 3:
	Part I		£20
	Part II		£40
	Part III		£270
	Part IV		£350
	Part V		£20
	All parameters		£700
C, D, E, 3, 4, 5	Schedule 4:
	Basic parameters		£40
	Additional parameters	Odour (quantitative) Taste (quantitative) Temperature Nitrite Ammonium Iron Aluminium Manganese Colour	£30 for all or any of these parameters)
		Trihalomethanes Tetrachloromethane Trichloroethene Tetrachloroethene	£50 (for all or any of these parameters)
		Copper Zinc	£15 (for both parameters or either of them)
		Polycyclic aromatic hydrocarbons v Benzo 3,4 pyrene	£ (for both parameters or either of them)
		Chloride Sulphate Calcium Magnesium Sodium Potassium Dry residues Oxidizability	£40 (for all or any of these parametrs)
		Total organic carbon	£20
		Boron	£40
		Surfactants	£40
		Phosphorus Cyanide	£80 (for both parameters or either of them)
		Fluoride Total hardness Alkalinity	£20 (for all or any of these parameters)
		Barium Silver Arsenic Cadmium Chromium Mercury Nickel Antimony Selenium	£100 (for all or any of these parameters)
		Residual disinfactant Colony counts	£15 (for both parameters or either of them)
	Coliform parameters		£20