What is Regulation 31?

Regulation 31 of The Water Supply (Water Quality) Regulations 2016 (as amended)1 implements Article 10 of the Council of the European Union Drinking Water Directive (DWD) in England and Wales for all chemicals and construction products used by water undertakers, from the source of the water, up to the point of delivery to the consumer’s building. It sets out how approvals can be given to such construction products and materials that do not prejudice water quality and consumer safety.

Does your product require approval?

Learn more about Reg 31 and find out if your product requires approval

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  1. Supplier information request

    Note: in order to complete the appropriate application form you may need to ask your supplier(s) to send confidential formulation information directly to us. Please click here for letters to use for this purpose.

Reg31 Enquiries

To contact the Regulation 31 team, please email reg31.enquiries@defra.gov.uk, or telephone +44(0)300 068 6400

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