Desborough Water Hardness & Quality Report (2026)

Anglian Water supplies Desborough, the north Northamptonshire town in the Welland Valley — a busy former boot and shoe manufacturing town north of Kettering, with a strong nonconformist heritage from its Quaker and chapel traditions, and a community now centred on light manufacturing and distribution in the north Northamptonshire corridor — from the Jurassic Oolitic Limestone (Lincolnshire Limestone) and Great Oolite aquifer boreholes in the north Northamptonshire supply zone, treated at Pitsford Water Treatment Works near Northampton. At 246.5 mg/L (17.3°Clark) and a TDS of 692.1 mg/L, Desborough's water is hard with an elevated TDS/hardness ratio (2.81) — reflecting calcium from the Jurassic Oolitic Limestone and significant sulphate from the Oxford Clay and Jurassic evaporite beds that underlie the north Northamptonshire clay vale.

Desborough lies in the north Northamptonshire Jurassic limestone belt where Anglian Water draws from Lincolnshire Limestone and Great Oolite boreholes. The Jurassic oolite delivers calcium carbonate groundwater enriched by sulphate from the Oxford Clay and the ironstone-bearing Northamptonshire Ironstone (Upper Jurassic), producing 246.5 mg/L with TDS 692.1 mg/L — hard, sulphate-enriched water consistent with the north Northamptonshire Jurassic supply zone at Kettering (250 mg/L) and Rothwell (250 mg/L) in the same Anglian Water north Northants distribution corridor.

At 246.5 mg/L, limescale is a persistent household challenge in Desborough. Kettles should be descaled monthly. The combi-boiler benefits from a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires generous quantities per wash. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaling product keeps fittings clean. The hard Jurassic limestone supply at Desborough is characteristic of the north Northamptonshire boot and shoe belt — the ironstone-bearing Jurassic limestone that once provided building stone for the village churches also mineralises the water in every household.