Serving parts of North West London and the Home Counties.

Our Water Quality reports


We are committed to delivering high quality water, so we check water leaving our treatment works, at service reservoirs and at customers’ taps. This is part of our regulatory monitoring programme. The vast majority of the results comply with the standards set in the Water Supply (Water Quality) Regulations 2000 (as amended), confirming that drinking water quality continues to be of a very high standard.

Our annual report on the quality of our drinking water gives information about our testing programme, the standards we must meet and the results for Affinity Water as a whole. It gives help with common water quality questions and has lots of useful information.

The Affinity Water area is split into 80 individual Water Supply Zones (WSZ) and we produce a separate report for each zone. The reports detail the results of all the samples taken in that zone together with a comment if a sample failed to meet the required standard.