Newquay Water Hardness & Quality Report (2026)

South West Water supplies Newquay, Cornwall, UK, sourcing water from moorland reservoirs and rivers across Devon and Cornwall. Key sources feeding into the system include the River Tamar catchment and reservoirs like Wistman's, Kennick, and Tottiford. The water destined for Newquay undergoes treatment at facilities such as the Goonvean plant or other nearby treatment centers, serving residents in the TR7 postcode area. This supply falls within South West England's extensive service region, which encompasses Cornwall, Devon, and parts of Somerset and Dorset.

The watershed for these supplies spans the Dartmoor and Bodmin Moor uplands. The underlying geology consists of granite intrusions and metasedimentary rocks dating back to the Devonian and Carboniferous periods. These formations are largely impermeable, which limits groundwater storage and encourages surface runoff into the reservoirs. This geological makeup, combined with brief percolation through acidic peaty soils and granite, results in very soft water. The process dissolves minimal minerals, maintaining the low dissolved solids characteristic of these moorland surface water supplies.

While the water is very soft, homeowners might notice minor limescale buildup in kettles and on showerheads, though it rarely impacts pipes or boilers significantly. Occasional descaling of appliances like kettles or showerheads with vinegar can easily manage this. Installing a water softener is an optional choice rather than a necessity, as the naturally low mineral content minimizes issues like spotting on glassware and soap scum. South West Water consistently meets UK drinking water standards, with reported pH levels typically between 7 and 8.5, and low concentrations of metals such as lead and copper well below regulated limits.