# The Water Resources (Control of Agricultural Pollution) (Wales) Regulations 2021, Paragraph 9

Extent: E+W

If any part of an effluent tank is below ground level, the tank must be designed and constructed so that it is likely to continue to satisfy the requirements of paragraphs 4 and 5 for at least 20 years without maintenance.

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Source: https://www.legislation.gov.uk/wsi/2021/77/schedule/5/paragraph/9 (the official version)
Page: https://openlegislation.uk/water-resources-control-of-agricultural-pollution-wales-regulations-2021/schedule-5/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.