Saltash Water Hardness & Quality Report (2026)

South West Water provides drinking water to Saltash, Cornwall, serving millions across Devon, Cornwall, and parts of Dorset and Somerset. The supply for Saltash originates mainly from surface water reservoirs like Roadford Lake, Colliford Lake, and Wistman's on Dartmoor. River intakes, including the Tamar, supplement this. Water undergoes treatment at facilities such as Roadford Water Treatment Works and Crownhill Works, employing processes like coagulation, filtration, chlorination, and fluoridation where needed. This area is classified as a standard soft water supply zone.

The water's journey begins in the upland moorland watersheds of Dartmoor and Bodmin Moor. These landscapes are defined by Carboniferous granite batholiths and meta-sedimentary slates. A thin layer of peat bog and soil covers impermeable bedrock, which prevents significant mineral dissolution. Unlike regions with limestone aquifers, this geology yields very soft water with low mineral content. Rainwater rapidly percolates through the terrain without prolonged contact with mineral-rich rock, resulting in a naturally soft supply.

Because the water is soft, homeowners in Saltash will notice minimal limescale buildup, which is good news for appliances like kettles and boilers. Soap lathers easily, and you might find your skin feels less dry. A water softener isn't necessary; instead, the focus is on managing potential pipe corrosion due to the low mineral content. If this becomes an issue, using phosphate dosing could help. For any rare deposits, a mild vinegar solution works well on fixtures. South West Water adheres to strict drinking water standards, with typical post-treatment pH levels between 7.5 and 8.5.