# The Private Water Supplies (Wales) Regulations 2017, Regulation 4: Wholesomeness

Extent: E+W

(1) A private water supply is to be regarded as wholesome if all the following conditions are met—
(a) it does not contain any micro-organism, parasite or substance, alone or in conjunction with any other substance, at a concentration or value that would constitute a potential danger to human health;
(b) it complies with the prescribed concentration or value for each parameter; and
(c) the water satisfies the formula “[nitrate]/50 + [nitrite]/3 ≤ 1”, where the square brackets signify the concentrations in mg/1 for nitrate (NO3) and nitrite (NO2).
(2) A reference in these Regulations to water being unwholesome means the requirements in paragraph (1) not being met.

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Source: https://www.legislation.gov.uk/wsi/2017/1041/regulation/4 (the official version)
Page: https://openlegislation.uk/private-water-supplies-wales-regulations-2017/regulation-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.