Heanor Water Hardness & Quality Report (2026)

Heanor, the Amber Valley Borough town in east Derbyshire between Ilkeston and Ripley on the Erewash valley fringe, is supplied by Severn Trent Water from the Derwent Valley Reservoirs (Ladybower, Derwent, Howden) supply transferred into the east Derbyshire network, supplemented by local groundwater from the Sherwood Sandstone and Namurian supply zone of the Erewash valley. At 130.5 mg/L Heanor is softer than Belper (179.5 mg/L) to the north-west — reflecting a supply zone with a higher proportion of soft Derwent reservoir water and less Carboniferous limestone groundwater influence than the limestone valley country around Belper. The Erewash valley at Heanor drains over Coal Measures (Carboniferous) — carboniferous shale, sandstone and mudstone without significant limestone beds — yielding moderate to soft local water with limited carbonate hardness. The TDS of 305.6 mg/L confirms a predominantly surface-water supply character with modest additional mineral content.

The Carboniferous Coal Measures of the Erewash valley and east Derbyshire coalfield consist of shales, mudstones and freshwater sandstones interbedded with coal seams — formations that lack the calcium-bearing limestone sequences of the White Peak to the west. Runoff and groundwater from this Coal Measures country carries limited calcium carbonate, contributing a softer mineralisation than the limestone-valley supply at Belper. Severn Trent distributes the Derwent reservoir soft-water supply through the east Derbyshire network, producing the characteristic 125–135 mg/L hardness of the Heanor and Amber Valley supply zone.

At 130.5 mg/L Heanor's water is moderately soft and limescale management is undemanding. Kettles need descaling every six to eight weeks with a light citric acid or white vinegar treatment. Shower screens develop only modest mineral spotting and clean easily. Washing-up liquid lathers well. Combi-boilers and white goods face low scaling risk. Heanor's character as a Derbyshire mining and textile town on the Nottinghamshire border is served by the moderately soft Derwent valley supply — softer than the Magnesian Limestone zones to the east but harder than the upper Derwent moorland source itself.