Deal Water Hardness & Quality Report (2026)

South East Water supplies Deal and surrounding communities in Kent, drawing primarily from groundwater. Its sources are boreholes that tap into the Chalk aquifer, with significant abstraction points in areas like Aylesham, Dover, and Sandwich. Water undergoes treatment at facilities such as the Deal Water Treatment Works, where processes include aeration, filtration, chlorination, and fluoridation. This supply serves East Kent and reaches a vast customer base across Kent, Sussex, and Hampshire, with the catchment area spanning the Kent Downs watershed. Precipitation infiltrates the permeable Cretaceous Chalk aquifer.

The region's geology is dominated by this karst limestone formation, which is interbedded with flint layers. As rainwater percolates through the Chalk, it naturally dissolves minerals like calcium and magnesium, resulting in a moderately mineralized and hard water profile. Eocene Reading Beds and London Clay act as confining layers, influencing groundwater flow through fissures. While coastal influences introduce minor saline risks, these are managed through blending, and the geology consistently yields groundwater with moderate mineral content.

Homeowners in the area may notice moderate limescale buildup in appliances like kettles, boilers, and showerheads, which can affect their efficiency and longevity. You might also see scum forming on fixtures and taps, and appliances such as washing machines and dishwashers can be impacted. Regularly descaling with common household solutions like vinegar or citric acid, and cleaning heating elements, can help manage these issues. While a water softener is an optional addition, it's often recommended for households experiencing persistent limescale problems to better protect plumbing and improve how soap lathers.