Humberstone Water Hardness & Quality Report (2026)

Severn Trent Water supplies Humberstone, an eastern suburb of Leicester, from a combination of Rutland Water — the largest artificial lake in England by surface area — and groundwater from the Lincolnshire Limestone and Triassic Sherwood Sandstone aquifers, treated at Rutland Water Treatment Works before distribution across Leicester and the East Midlands. At 248 mg/L (17.4°Clark), Humberstone's water is in the hard to very hard range, with a TDS of 718.1 mg/L confirming significant dissolved mineral content driven by the Jurassic limestone and chalk geology of the region.

Rutland Water is fed by the Rivers Welland and Gwash, which drain the Jurassic limestone country of Rutland, Northamptonshire, and Lincolnshire. These rivers carry significant dissolved calcium from the Great Oolite and Lincolnshire Limestone formations throughout their catchments, entering Rutland Water with consistently hard water. Groundwater from the Lincolnshire Limestone aquifer supplements reservoir supply with comparable hardness. Together, these limestone-dominated sources produce the high hardness recorded in the Leicester supply zone.

Limescale is a persistent and significant household concern in Humberstone. Kettles should be descaled monthly, and fortnightly descaling is worthwhile for households using the kettle heavily, to prevent element damage and chalky deposits in drinks. The combi-boiler benefits from a fitted scale inhibitor — essential at this hardness level — and annual servicing to check the heat exchanger. Washing-up liquid requires more product than the bottle suggests to maintain adequate lather. Taps and shower heads develop visible white limescale within a week or two; a fortnightly wipe with white vinegar or a proprietary descaler is recommended, and a scale inhibitor or water softener is strongly advisable for long-term appliance protection.