Crofton Park Water Hardness & Quality Report (2026)

Thames Water Utilities Limited supplies Crofton Park in the London Borough of Lewisham, Greater London. The water comes from a mix of groundwater drawn from the London Basin aquifer and surface water from the River Thames and its tributaries, including sites like the Lee Valley. Major treatment plants like Hampton, Island, and Ashford Common handle the supply for over 15 million customers across London and the Thames Valley region. Thames Water adheres to Drinking Water Inspectorate standards through frequent testing. The supply originates from the Thames River Basin watershed, which features catchments rich in chalk and limestone in South East England.

Key geological features include the Cretaceous Chalk aquifer and the underlying Tertiary sands of the Lambeth Group, both common in the London Basin. This geology naturally results in very hard water. As rainwater filters through these calcium-rich rocks, it dissolves significant amounts of minerals. The combination of groundwater from these aquifers and treated river water contributes to the region's naturally mineralized water profile.

This very hard water can lead to noticeable limescale buildup in appliances like kettles, boilers, washing machines, and showerheads, potentially reducing their efficiency and lifespan. You might also see chalky deposits on taps and bathroom fixtures, requiring regular cleaning. To manage this, homeowners can try wiping surfaces with vinegar or lemon juice, using scale collectors in kettles, setting hot water temperatures to around 60°C, and descaling appliances periodically. Many households find installing water softeners beneficial for protecting plumbing and reducing these effects. Thames Water consistently meets UK standards, with a typical pH between 7.5 and 8.5, and lead and copper levels remain within safe limits. Treatment processes, including coagulation, filtration, chlorination, and UV disinfection, ensure safe, potable water, with seasonal algae management addressing occasional taste or odor concerns.