# The Bathing Waters (Classification) Regulations 1991, Paragraph 1


Subject to the following provisions of this Schedule, the criteria for the classification BW1 are that –
(a) at least 95 per cent of samples of the waters taken and tested in accordance with Schedule 2 must conform to the parametric values specified in Schedule 3;
(b) no sample of the waters taken in accordance with Schedule 2 which when tested for compliance with the phenols parameter by the absorption method or with the transparency parameter fails to comply shall have a value which deviates from the relevant parametric value for that parameter specified in Schedule 3 by more than 50 per cent;
(c) consecutive samples of the waters taken in accordance with Schedule 2 at statistically suitable intervals shall not when tested deviate from the relevant parametric values specified in Schedule 3.

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Source: https://www.legislation.gov.uk/uksi/1991/1597/schedule/1/paragraph/1 (the official version)
Page: https://openlegislation.uk/bathing-waters-classification-regulations-1991/schedule-1/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.