Drinking Water Inspectorate (DWI) (7.20 minute)
Drinking water quality in England and Wales is regulated by the DWI. It ensures that all
companies supply water that is safe to drink and complies with all National and European
standards. A company reports all results of the samples taken at customers’ taps, treatment
works and reservoirs to the DWI on a monthly basis. To verify the results the DWI carries out
Audits and can inspect any sites or activities with little or no warning. They will conduct an
investigation into any incident that affects drinking water quality, and follow up any
customer complaints relating to water quality.