Dover Water Hardness & Quality Report (2026)

South East Water provides drinking water to Dover and surrounding communities in Kent, serving a vast customer base across several southeastern counties. The utility draws its supply from a combination of sources. The primary source is the Chalk Aquifer, accessed through numerous boreholes, which is supplemented by surface water from rivers like the River Stour and smaller reservoirs, notably those near Folkestone. Water undergoes rigorous treatment at facilities such as the Aylesham and Dover treatment plants. Here, processes including coagulation, filtration, chlorination, and fluoridation are employed to ensure the water meets the stringent standards set by the Drinking Water Inspectorate.

The geology underpinning this region significantly influences the water's characteristics. The Chalk Group, a prominent aquifer composed of white limestone dating back to the Cretaceous period, is the dominant geological feature. This porous rock, riddled with fractures, allows groundwater to percolate and dissolve calcium carbonate, contributing minerals that result in a moderately hard water profile. Surface runoff from areas underlain by the Lower Greensand Group can also add to the water's mineral content, creating a naturally mineralised supply typical of southeast England.

This moderately hard water can lead to visible scale buildup on household appliances like kettles, boilers, and showerheads, impacting their efficiency and longevity. You might also notice limescale deposits on glassware from dishwashers or on fabrics washed in machines. To combat this, regular descaling with common household solutions, or the use of rinse aids and magnetic conditioners, can offer some relief. For persistent issues and to protect plumbing, installing a water softener is often recommended, as it also aids in improving soap lathering. The water's pH typically ranges between 7.2 and 7.8, well within regulatory limits.