The Private Water Supplies (England) Regulations 2016

Regulations 4, 9 and 11

SCHEDULE 1 Prescribed concentrations or values

PART 1 Wholesomeness

Table A

MICROBIOLOGICAL PARAMETERS

Prescribed concentrations or values

Parameters	Maximum concentration or value	Units of measurement
Escherichia coli (E. coli)	0	Number/100ml
Enterococci	0	Number/100ml
In the case of water in bottles or containers:
Colony count 22°C	100	Number/ml
Colony count 37°C	20	Number/ml
Escherichia coli (E. coli)	0	Number/250ml
Enterococci	0	Number/250ml
Pseudomonas aeruginosa	0	Number/250ml

Table B

CHEMICAL PARAMETERS

Part I: Directive requirements - prescribed concentration or values

Parameters	Maximum concentration or value	Units of measurement
(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 also the nitrate-nitrite formula in regulation 4(c).
(iii) For these purposes, “pesticides” means— organic acaricides; organic algicides; organic fungicide; organic herbicides; organic insecticides; organic nematocides; organic rodenticides; organic slimicides; related products (inter alia, growth regulators and their relevant metabolites, degradation and reaction products). Only those pesticides likely to be present in a given supply need be monitored.
(iv) “Pesticides total” means the sum of the concentrations of the individual pesticides detected and quantified in the monitoring process.
(v) The specified compounds are— 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.
(vi) The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
(vii) The specified compounds are— bromodichloromethane; bromoform; chloroform; dibromochloromethane The parametric value applies to the sum of the concentrations of the individual compounds detected and quantified in the monitoring process.
Acrylamide(i)	0.10	μg/l
Antimony	5.0	μg/l
Arsenic	10	μg/l
Benzene	1.0	μg/l
Benzo(a)pyrene	0.010	μg/l
Boron	1.0	mg/l
Bromate	10	μg/l
Cadmium	5.0	μg/l
Chromium	50	μg/l
Copper	2.0	mg/l
Cyanide	50	μg/l
1, 2 dichloroethane	3.0	μg/l
Epichlorohydrin(i)	0.10	μg/l
Fluoride	1.5	mg/l
Lead	10	μg/l
Mercury	1.0	μg/l
Nickel	20	μg/l
Nitrate(ii)	50	mg/l
Nitrite(ii)	0.5 (or 0.1 in the case of treatment works)	mg/l
Pesticides(iii)—
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
Pesticides total(iv)	0.50	μg/l
Polycyclic aromatic hydrocarbons(v)	0.10	μg/l
Selenium	10	μg/l
Tetrachloroethene and Trichloroethene(vi)	10	μg/l
Trihalomethanes: Total(vii)	100	μg/l
Vinyl chloride(i)	0.50	μg/l
Part II: National requirements – prescribed concentrations or values
Parameters	Maximum concentration or value	Units of measurement
Aluminium	200	μg/l
Colour	20	mg/l Pt/Co
Iron	200	μg/l
Manganese	50	μg/l
Odour	Acceptable to consumers and no abnormal change
Sodium	200	mg/l
Taste	Acceptable to consumers and no abnormal change
Tetrachloromethane	3	μg/l
Turbidity	4	NTU

PART 2 Indicator parameters (excluding radioactive substances)

Table C

Prescribed concentrations, values or states

Parameters	Maximum concentration or value or state (unless otherwise stated)	Units of measurement
(i) The water should not be aggressive.
(ii) Only in the case of surface water or groundwater that has been influenced by surface water.
Ammonium	0.50	mg/l
Chloride(i)	250	mg/l
Clostridium perfringens (including spores)	0	Number/100ml
		Number/100ml (Number/250
Coliform bacteria	0	ml in the case of water put into bottles of containers)
	No abnormal change	Number/ml at 22°
Colony counts	No abnormal change	Number/ml at 37°C
Conductivity(i)	2500	μS/cm at 20°C
Hydrogen ion	9.5 (maximum)	pH value
	6.5 (minimum) (in the case of
	still water put into bottles or containers the minimum is 4.5)	pH value
Sulphate(i)	250	mg/l
Total organic carbon (TOC)	No abnormal change	mgC/l
Turbidity(ii)	1	NTU

PART 3 Indicator parameters (radioactive substances)

Table D

Parametric values for indicative does, randon and tritium of water intended for human consumption

Parameters	Maximum concentration or value or state (unless otherwise stated)	Units of measurements
(i) Where treatment to reduce the level of radionuclides in water intended for human consumption has been taken, monitoring must be carried out under Part 1 of Schedule 2 to ensure the continued efficacy of the treatment.
(ii) Enforcement action by a local authority is deemed justified on radiological protection grounds without further consideration where randon concentrates exceed 1,000 Bq/1.
(iii) If tritium concentration exceeds its parametric value, an investigation (which may include analysis) of the presence of artificial radionuclides must be carried out.
Indicative dose (for radioactivity(i)	0.10	mSv
Gross alpha	0.1	Bq/1
Gross beta	1.0	Bq/1
Radon(ii)	100	Bq/1
Tritium (for radioactivity)(iii)	100	Bq/1