Operated by LRQA, on behalf of over twenty water utility companies, the Water Industry Registration Scheme (WIRS) permits accredited organisations to undertake works regarding water mains and supplies to properties.

Since 2020, SNR ENG Ltd is an accredited water mains designer and experienced in numerous supply areas such as Affinity Water, Anglian Water, Bristol Water, Cambridge Water, Essex & Suffolk Water, Scottish Water, SES Water, Severn Trent Water, South East Water, South Staffordshire Water, South West Water, Southern Water, Thames Water and Yorkshire Water. Furthermore, this experience includes NAVs such as Albion Water, ESP Water, Icosa Water Services, Indpendent Water Networks Ltd (IWNL) and Leep Networks.