New Mills Water Hardness & Quality Report (2026)

Severn Trent Water supplies the town of New Mills, drawing from a mixed portfolio of sources. These include the expansive Derwent, Howden, and Ladybower Reservoirs in the Upper Derwent Valley, alongside the River Derwent. Groundwater from Triassic sandstone aquifers also contributes to the supply. Water undergoes treatment at facilities such as the Derwent Valley Water Treatment Works and Rivelin Works, serving areas across Derbyshire and Greater Manchester. The overall supply originates from the Pennine upland watershed, a region encompassing the Peak District National Park.

The geological landscape around New Mills is a key factor in its water chemistry. It features Carboniferous limestone and Millstone Grit series, with deeper Triassic Sherwood Sandstone aquifers. As rainwater filters through these mineral-rich formations, particularly the carbonate-rich limestones and magnesium-bearing sandstones, it dissolves significant amounts of calcium and magnesium. This process results in water that is characteristically hard, though some surface sources from moorland catchments can introduce slightly softer inputs, leading to a blended, moderately hard to hard water profile across the region.

Homeowners in New Mills may notice the effects of moderately hard to hard water, such as limescale buildup on appliances like kettles, boilers, and showerheads. This buildup can reduce the efficiency and lifespan of these devices, as well as dishwashers and hot water systems. Regular descaling with solutions like vinegar can help manage this, as can installing filter jugs for drinking water. For those in areas with particularly hard water, a water softener is often recommended to protect plumbing and improve how effectively soap lathers. Severn Trent Water adheres to strict drinking water standards, with lead and copper levels well within limits, and agricultural pesticides managed through source control and advanced treatment processes.