Folkestone Water Hardness & Quality Report (2026)

South East Water provides drinking water to Folkestone and surrounding areas in Kent, southeast England. Their supply primarily comes from the local Chalk aquifer, with water drawn from boreholes. Treatment takes place at facilities like the Folkestone Water Treatment Works, where processes such as filtration and disinfection are employed to ensure the water meets quality standards. Unlike some areas, this supply doesn't rely on surface water from rivers or reservoirs; instead, the Kent Downs watershed plays a crucial role in recharging the aquifer.

The water originates from the Chalk Group aquifer, a significant groundwater source in Kent. This formation, dating back to the Upper Cretaceous period, is characterized by white micritic limestone, often containing flint nodules. Its porous and karstic nature allows rainwater to percolate deep into the ground. As the water moves through this soluble limestone, it dissolves high levels of calcium carbonate, resulting in a supply that is notably hard due to its elevated mineral content.

Homeowners in this area will likely notice limescale buildup in appliances like kettles and boilers, which can affect their efficiency and shorten their lifespan. You might also see white deposits on faucets and fixtures, and soap scum can be more persistent in bathrooms. To combat this, regular descaling with common household items like vinegar or citric acid is a good idea. Some residents opt for scale filters or even a whole-house water softener, particularly those with combi boilers. South East Water ensures the water meets Drinking Water Inspectorate standards, with chlorination used for disinfection. Free lead testing is also available for properties that request it.