Kettering Water Hardness & Quality Report (2026)

Kettering, the North Northamptonshire town on the Jurassic ironstone and limestone escarpment, is supplied by Anglian Water from the Northamptonshire Jurassic Limestone and Chalk Aquifer resources. Anglian Water draws from licensed boreholes into the Lincolnshire Oolite (Lincolnshire Limestone), Northampton Sand Formation, and the Cretaceous Chalk of the Northamptonshire and east Midlands supply area. Kettering sits on the Jurassic ironstone-limestone ridge — the same geological escarpment responsible for the town's historic iron and steel industry — and Anglian Water's supply blend incorporates both Jurassic oolitic limestone groundwater and chalk-derived supply from the Northamptonshire and Cambridgeshire chalk. Water is treated at Anglian Water's east Midlands facilities before distribution to Kettering.

Kettering's hard water — 229 mg/L (16.1°Clark) — reflects the Jurassic Lincolnshire Oolite and Chalk Aquifer contribution. The Lincolnshire Limestone is a Jurassic oolitic limestone — a productive hard water aquifer — while the Cretaceous Chalk of the east Midlands contributes very high dissolved calcium. Both formations dissolve high calcium concentrations in percolating groundwater, and the Anglian Water supply blend serving Kettering draws substantially from both. The Drinking Water Inspectorate (DWI) classifies this supply as hard.

Limescale is a persistent household challenge in Kettering. At 229 mg/L, limescale forms in kettles within two to three weeks and monthly or fortnightly descaling is advisable. Combi-boiler heat exchangers accumulate deposits steadily — annual boiler servicing and fitting an in-line scale inhibitor are strongly recommended. Showerheads, taps, and shower screens develop consistent deposits. Washing-up liquid lathers poorly. Using Calgon monthly in the washing machine and maintaining a regular descaling routine is important limescale management for Kettering households.