http://www.legislation.gov.uk/id/wsi/2007/3165

SCHEDULE 2Requirements for spring water and drinking water including prescribed concentrations or values of parameters

PART 2Prescribed concentrations or values

Table A

Column 1	Column 2	Column 3	Column 4
Item	Parameters	Units of Measurement	Concentration or Value (maximum unless otherwise stated)
1.	Colour	mg/1 Pt/Co scale	20
2.	Turbidity	NTU	4
3.	Odour	Dilution number	3 at 25°C
4.	Taste	Dilution number	3 at 25°C
5.	Sulphate	mg SO₄/1	250
6.	Sodium	mg Na/l	200
7.	Nitrate	mg NO₃/l	50 (note 1)
8.	Nitrite	mg NO₂/l	0.5 (note 1)
9.	Aluminium	μgAl/l	200
10.	Copper	mg Cu/l	2
11.	Fluoride	mg F/l	1.5
12.	Hydrogen ion concentration	pH units	4.5 (minimum) 9.5 (maximum)
13.	Tritium (for radioactivity)	Bq/l	100
14.	Total indicative dose	mSv/year	0.10 (note 2)
15.	Manganese	μg Mn/l	50
Notes: 1. The concentration (mg/l) of nitrate divided by 50 added to the concentration (mg/l) of nitrite divided by 3 must not exceed 1. 2. Excluding tritium, potassium-40, radon and radon decay products.

Table B

Column 1	Column 2	Column 3	Column 4
Item	Parameters	Units of Measurement	Maximum Concentration
1.	Arsenic	μg As/l	10
2.	Cadmium	μg Cd/l	5
3.	Cyanide	μg CN/l	50
4.	Chromium	μg Cr/l	50
5.	Mercury	μg Hg/l	1
6.	Nickel	μg Ni/l	20
7.	Selenium	μg Se/l	10
8.	Antimony	μg Sb/l	5
9.	Lead	μg Pb/l	10
10.	Pesticides and related products:
	— individual substances	μg/l	0.10 (notes 1 and 2)
	— total substances	μg/l	0.50 (notes 1 and 3)
11.	Polycyclic aromatic Hydrocarbons	μg/l	0.1 sum of concentrations of specified compounds (note 4)
12.	Bromate	μg BrO3/l	10
Notes: 1. “Pesticides” means: organic insecticides, organic herbicides, organic fungicides, organic nematocides, organic acaricides, organic algicides, organic rodenticides, organic slimicides, and related products (inter alia, growth regulators) and their relevant metabolites, degradation and reaction products. Only those pesticides which are likely to be present in a given water need to be monitored. 2. The maximum concentration applies to each individual pesticide. In the case of aldrin, dieldrin, heptaclor and heptachlor epoxide the maximum concentration is 0.030 μg/l. 3. The maximum concentration for “total substances” refers to the sum of the concentrations of all individual pesticides detected and quantified in the monitoring procedure. 4. The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1.2,3-cd) pyrene.

Table C

Column 1	Column 2	Column 3	Column 4
Item	Parameters	Units of Measurement	Maximum Concentration
1.	Escherichia coli(E.coli)	number/250 ml	0/250 ml
2.	Enterococci	number/250 ml	0/250 ml
3.	Colony count 22°C	number/ml	100/ml (notes 1 and 2)
4.	Colony count 37°C	number/ml	20/ml (notes 1 and 3)
5.	Pseudomonas aeruginosa	number/250ml	0/250 ml
Notes: 1. The total viable colony count should be measured within 12 hours of bottling, with the sample water being kept at a constant temperature during that 12 hour period. Any increase in the total viable colony count of the water between 12 hours after bottling and the time of sale should not be greater than that normally expected. 2. In 72 hours on agar-agar or an agar-gelatine mixture. 3. In 24 hours on agar-agar.

Table D

Column 1	Column 2	Column 3	Column 4
Item	Parameters	Units of Measurement	Maximum Concentration
1.	Boron	mg/l	1.0
2.	Benzo (a) pyrene	μg/l	0.010
3.	Tetrachloroethene and Trichloroethene	μg/l	10 (note 1)
4.	Tetrachloromethane	μg/l	3
5.	Benzene	μg/l	1.0
6.	1,2-dichloroethane	μg/l	3.0
7.	Trichloromethane, Dichlororbromomethane, Dibromochloromethane and Tribromomethane	μg/l	100 (note 1)
8.	Epichlorohydrin	μg/l	0.10 (note 2)
9.	Vinyl chloride	μg/l	0.50 (note 2)
10.	Acrylamide	μg/l	0.10 (note 2)
Notes: 1. The maximum concentration specified applies to the sum of the concentrations of the specified parameters. 2. 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.