Knowle Water Hardness & Quality Report (2026)

For residents of Knowle, located in the Solihull borough of the West Midlands, Severn Trent Water provides the area's water supply. This service utilizes a mixed source strategy, drawing from underground Triassic Sherwood Sandstone aquifers, surface reservoirs such as those found in the Elan Valley system, and rivers including the River Severn and River Trent. Water purification takes place at significant facilities like the Frankley Water Treatment Works, which serves upland reservoir water, and Minworth Works, processing groundwater and river water for the broader West Midlands area. The watershed itself spans the upper catchments of the Severn and Trent rivers, receiving contributions from the Welsh uplands and the Midlands Plateau.

The underlying geology plays a crucial role in shaping the water's character. Predominant rock formations include Carboniferous Limestone in the headwaters, alongside Permian mudstones and vast Triassic sandstones that form the main aquifer system. These rock types, particularly those rich in carbonates and evaporites, dissolve easily as water percolates through the fissures and porous layers. This geological process is the primary reason for the water's consistently hard nature before it is even abstracted for treatment.

Homeowners in this hard water region will likely notice scale buildup on appliances like kettles, boilers, and showerheads, which can diminish their efficiency and shorten their lifespan. Washing machines and dishwashers may require more detergent for effective cleaning, and you might find that soap doesn't lather as readily in the bath. To combat limescale damage to heating elements and pipework, regular descaling with common household solutions like vinegar, fitting scale filters to taps, or installing a whole-house water softener are practical steps to consider. The treated water typically falls within a pH range of 7.5 to 8.5.