Pinxton Water Hardness & Quality Report (2026)

Severn Trent Water supplies Pinxton, a former mining and industrial town in the Erewash Valley at the Derbyshire–Nottinghamshire border near Kirkby-in-Ashfield, from the Derwent Valley Reservoirs blended with Triassic Sandstone (Sherwood Sandstone) and Magnesian Limestone (Permian Zechstein) groundwater in the east Derbyshire–Erewash distribution zone, treated at Bamford Water Treatment Works in the upper Derwent. At 172.5 mg/L (12.1°Clark), Pinxton's water is moderately hard, reflecting the eastward transition from soft Derwent Valley moorland supply toward the harder Magnesian Limestone and Triassic groundwater zone of the Nottinghamshire–Derbyshire border.

Pinxton sits at the eastern margin of the Erewash Valley coalfield, at the transition between the Carboniferous Coal Measures and the Permian Magnesian Limestone belt that extends east through Kirkby-in-Ashfield, Mansfield, and Newark. Severn Trent Water's east Derbyshire distribution zone blends the soft Derwent Valley reservoir baseline with harder groundwater from the Triassic Sherwood Sandstone and Permian Magnesian Limestone aquifers that underlie the Trent Valley east of Derby. The resulting 172.5 mg/L with TDS 446 mg/L reflects this geological transition in the supply blend.

At 172.5 mg/L, limescale is a noticeable household concern in Pinxton. Kettles benefit from descaling every four to six weeks. The combi-boiler should be fitted with a scale inhibitor and serviced annually. Washing-up liquid requires slightly more product than in softer areas. Taps and shower heads develop moderate limescale deposits within two to three weeks; a monthly wipe with white vinegar keeps fixtures in good condition. The moderately hard supply reflects Pinxton's position at the boundary between the soft Derwent Valley and the harder Magnesian Limestone Nottinghamshire belt.