Dursley Water Hardness & Quality Report (2026)

South West Water supplies Dursley, drawing primarily from moorland reservoirs within the Dartmoor and Wessex catchments. Treated at facilities like the Bristol or Avonmouth works, this surface water serves residents across Devon, Cornwall, and parts of Somerset and Gloucestershire. The watershed's upland moorlands are characterized by Devonian-era granite and metamorphic rock formations. These feed the reservoirs with peaty runoff that has minimal contact with mineral-rich underground strata. Consequently, the water's character leans towards soft to slightly hard.

The underlying geology, particularly the impermeable Dartmoor granite, significantly limits the dissolution of minerals like calcium and magnesium. This geological makeup contrasts sharply with water sourced from limestone aquifers, which typically picks up more dissolved solids. The Devonian period formations contribute to a naturally low mineral content in the supply, explaining its softer profile compared to regions with chalky geology.

Homeowners might notice minor limescale buildup in kettles or showerheads with this slightly hard water, though the risk to pipes and boilers remains low. Appliances such as washing machines and dishwashers could see reduced efficiency over time due to slight deposits. A simple vinegar solution can help with regular descaling, and using rinse aids is beneficial. Installing a water softener is an optional step, generally not essential unless scaling becomes a noticeable issue.