# The Natural Mineral Water, Spring Water and Bottled Drinking Water (England) Regulations 2007, Paragraph 7

Extent: E+W

(1) After bottling, the total colony count of the water at source may not exceed—
(a) 100 per ml at 20 to 22 oC in 72 hours on agar-agar or an agar-gelatine mixture; and
(b) 20 per ml at 37 oC in 24 hours on agar-agar.
(2) The total colony count shall be measured within the period of 12 hours following bottling, the water being maintained at 4 oC +/- 1 oC during the period before which it is measured.

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Source: https://www.legislation.gov.uk/uksi/2007/2785/schedule/4/paragraph/7 (the official version)
Page: https://openlegislation.uk/natural-mineral-water-spring-water-and-bottled-drinking-water-england-regulations-2007/schedule-4/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.