The Natural Mineral Water, Spring Water and Bottled Drinking Water (Wales) Regulations 2015

PART 2 E+W Parametric values for microbiological and chemical parameters

Table A: Microbiological Parameters

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.
Item	Parameter	Units of Measurement	Maximum Concentration or Value
1.	Escherichia coli (E coli)	number/250 ml	0/250 ml
2.	Enterococci	number/250 ml	0/250 ml
3.	Pseudomonas aeruginosa	number/250ml	0/250 ml
4.	Colony count 22ºC	number/ml	100/ml 12
5.	Colony count 37ºC	number/ml	20/ml13

Table B: Chemical Parameters

1 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.
2 The concentration (mg/l) of nitrate divided by 50 added to the concentration (mg/l) of nitrite divided by 3 must not exceed 1.
3 “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.
4 The maximum concentration applies to each individual pesticide. In the case of aldrin, dieldrin, heptachlor and heptachlor epoxide the maximum concentration is 0.030 µg/l.
5 The maximum concentration for “total substances” refers to the sum of the concentrations of all individual pesticides detected and quantified in the monitoring procedure.
6 The specified compounds are benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(ghi)perylene, indeno(1,2,3-cd)pyrene.
7 The maximum concentration specified applies to the sum of the concentrations of the specified parameters.
Item	Parameter	Units of Measurement	Maximum Concentration or Value
1.	Acrylamide	µg/l	0.10 1
2.	Antimony	µg Sb/l	5
3.	Arsenic	µg As/l	10
4.	Benzene	µg/l	1.0
5.	Benzo (a) pyrene	µg/l	0.010
6.	Boron	mg/l	1.0
7.	Bromate	µg/l BrO3/l	10
8.	Cadmium	µg Cd/l	5
9.	Chromium	µg Cr/l	50
10.	Copper	mg Cu/l	2
11.	Cyanide	µg CN/l	50
12.	1,2-dichloroethane	µg/l	3.0
13.	Epicholorohydrin	µg/l	0.10 1
14.	Fluoride	mg F/l	1.5
15.	Lead	µg Pb/l	10
16.	Mercury	µg Hg/l	1
17.	Nickel	µg Ni/l	20
18.	Nitrate	mg NO3/l	50 2
19.	Nitrite	mg NO2/l	0.5 2
20.	Pesticides and related products:
	- individual substances	µg/l	0.10 34
	- total substances	µg/l	0.50 35
21.	Polycyclic aromatic hydrocarbons	µg/l	0.1 sum of concentrations of specified compounds 6
22.	Selenium	µg Se/l	10
23.	Tetrachloroethene and Trichloroethene	µg/l	10 7
24.	Trichloromethane, Dicholrorbromomethane, Dibromocholromethane and Tribromomethane	µg/l	100 7
25.	Vinyl chloride	µg/l	0.50 1