# Regulation (EC) No 853/2004 of the European Parliament and of the Council of 29 April 2004 laying down specific hygiene rules for food of animal origin, Division 2: Tanks and water storage containers must meet the following requirements:

Extent: E+W+S+N.I.

(a) Internal surfaces must be smooth, durable, impermeable and easy to clean.
(b) They must be constructed so as to allow complete draining of water.
(c) Any water intake must be situated in a position that avoids contamination of the water supply.

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Source: https://www.legislation.gov.uk/eur/2004/853/annex/III/section/VII/chapter/III/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2004-853/annex-III/section-VII/chapter-III/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.