Corby Water Hardness & Quality Report (2026)

Anglian Water Services supplies Corby, Northamptonshire, with water sourced from groundwater aquifers and the River Welland, supplemented by nearby reservoirs. Treatment occurs at Pitsford Water Treatment Works and other regional groundwater plants. This supply serves over 6 million customers across the Anglian region, covering Northamptonshire and surrounding counties. The watershed includes the Nene and Welland river catchments, flowing through geological strata that contribute to the water's characteristics.

The water originates from the Mercia Mudstone Group and Sherwood Sandstone Group aquifers. Rainwater percolates through these Permian and Triassic formations, which include limestone-influenced sandstones and mudstones. This geological makeup, characterized by carbonate-bearing strata similar to limestone and chalk deposits, naturally dissolves calcium and magnesium ions, resulting in a characteristically hard water supply for the East Midlands.

Homeowners in Corby often notice limescale buildup on appliances like kettles, boilers, and showerheads, which can decrease their efficiency and necessitate frequent descaling. Dishwashers and washing machines can also be affected, with potential for pipe blockages over time. While cleaning with vinegar can help, many households find that installing a water softener is the most effective way to reduce scale formation and improve how well soap lathers. The water quality consistently meets UK Drinking Water Inspectorate standards, with typical pH levels between 7.2 and 7.6.