Louth Water Hardness & Quality Report (2026)

Anglian Water supplies Louth, the market town of the Lincolnshire Wolds Area of Outstanding Natural Beauty. Supply is drawn from the Lincolnshire Chalk aquifer beneath the Wolds — a southern continuation of the East Anglian Chalk — and from upland reservoir and borehole sources in the Wolds catchment, treated at Louth Water Treatment Works before distribution across this part of north-east Lincolnshire. At 243.5 mg/L (17.1°Clark), Louth's water is hard, reflecting the dominant influence of the Lincolnshire Chalk and Lincolnshire Limestone that underlie the Wolds and their flanks.

The Lincolnshire Wolds are formed by gently dipping Upper Cretaceous Chalk — the same formation that produces the hard water of East Anglia and north Norfolk — overlying the Jurassic Lincolnshire Limestone that outcrops further west. Groundwater infiltrating the chalk from the Wolds plateau dissolves calcium carbonate during percolation through the porous rock, producing characteristically hard calcium bicarbonate water. The resulting hardness, at 243.5 mg/L with a TDS of 682.4 mg/L, is typical of Anglian Water communities drawing on chalk aquifer sources in Lincolnshire.

At 243.5 mg/L, limescale is a persistent household concern in Louth. Kettles should be descaled monthly, with fortnightly descaling worthwhile for frequent users, to prevent element degradation and calcium particles in drinks. The combi-boiler benefits from a fitted scale inhibitor to protect the heat exchanger, and annual servicing is recommended. Washing-up liquid requires more product than in softer areas to achieve adequate lather. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaler keeps fittings clean and prevents hard-water staining from building up permanently.