Regulation 31 controls the use of products, materials, chemicals and processes in contact with water intended for public drinking-water supply in England and Wales. It forms part of the Water Supply (Water Quality) Regulations and is a key regulatory gateway for ensuring that products used by water undertakers do not adversely affect drinking-water quality. This AI Assistant helps users explore the DWI Regulation 31 package* and related documentation, including approval guidance, application requirements, advice sheets, approved-product information, Instructions for Use and related standards or supporting documents. It is intended to provide a structured starting point for Regulation 31 queries by retrieving from a curated set of relevant documents. This includes documentation relevant to testing expectations and evidence requirements before Drinking Water Inspectorate approval, where applicable. The assistant can help with questions about whether Regulation 31 may apply, what information may be needed for an application, how approved-list conditions and Instructions for Use should be understood, and why other certifications such as WRAS approval do not automatically mean Regulation 31 approval. The assistant is more accurate and focused than generic AI chatbots because it is specialised through retrieval from curated Regulation 31 documentation.

​

Please click the blue chat speech bubble on the bottom right to start

​

Disclaimer: These results are provided “as is” for demonstration purposes and are not guaranteed to be 100% accurate. Whilst responses are based on carefully curated documentation and retrieval from a Regulation 31 document set, users are advised to follow links and confirm any results produced against the latest DWI guidance, approved-product lists and Instructions for Use. The information is provided with no guarantees of completeness, accuracy, usefulness or timeliness. ACQUIRE does not guarantee suitability for real-world use and will not be liable for any loss or damage. Please also note that the assistant is not officially endorsed by the DWI.

​

* Document set updated with relevant documentation to 21 July 2026.

​

Regulation 31 approval guidance: https://www.dwi.gov.uk/drinking-water-products/reg-31-approval/

Dashboard for approved products: https://www.dwi.gov.uk/drinking-water-products/resources-for-water-companies/approved-considered-products/approved_products/

​