Network latest

13.03.26
Cheam Water Treatment Works – Increased water hardness 
We want to thank our customers for their patience and to provide an update for customers who are experiencing increased water hardness coming from our Cheam Water Treatment Works. This is due to us needing to make important repairs to our softening plant. 

We’re unique in the water industry in having a legal obligation to soften the groundwater we treat, and we’ve made significant investment in our softening capability over recent years. 

The main areas supplied by our Cheam Water Treatment works include Cheam, Sutton, Worcester Park, Ewell, Morden, Carshalton, Carshalton Beeches and South Sutton. 
We’re extremely proud of our water quality, which is industry leading as confirmed by the Drinking Water Inspectorate (DWI) in its 2025 report. 

We’d like to reassure you there are no health concerns associated with the increased water hardness and the water can be consumed and used as normal. You may however notice a slight change to the taste of your water, an increase in limescale and you may experience a film on cups of tea as an example.  

Our teams are working hard to make the repairs as quickly as possible and return to softening your water as normal. We’re aiming to complete this by the end of March and we’re sorry for the disruption caused in the meantime.