Stratford-upon-Avon Water Hardness & Quality Report (2026)

Stratford-upon-Avon, the Warwickshire market town and birthplace of William Shakespeare on the River Avon, is supplied by Severn Trent Water. The principal source for mid-Warwickshire is Draycote Water, a large reservoir near Rugby fed by the River Leam, whose catchment drains Triassic Mercia Mudstone, Lias Clay and Jurassic sandstone — mixed sedimentary geology that yields relatively low-mineral surface runoff. Water is treated at Frankton Water Treatment Works near Rugby and distributed south-west through the Warwickshire network to Stratford-upon-Avon. The moderate TDS of 303.5 mg/L and hardness of only 133 mg/L reflect the dominance of low-calcium clay and mudstone geology in the Leam catchment, with limited limestone groundwater blending compared with the harder eastern Midlands zones.

The Leam catchment north of Coventry drains Triassic Mercia Mudstone and Lias Clay — impermeable, low-calcium formations — rather than the chalk or oolitic limestone that dominates harder-water English counties. While the River Avon itself flows through Jurassic limestone country in its upper reaches around Naseby, by the time it reaches Stratford the river has mixed with clay-dominated tributaries that dilute the limestone-derived hardness. Draycote Water, with its clay-dominated catchment, provides a consistently moderately soft supply to the Stratford area.

At 133 mg/L Stratford-upon-Avon has moderately soft water — a pleasant surprise for a Midlands town. Limescale accumulates only gradually. Kettles need descaling every six to eight weeks, and shower screens remain clean for several weeks between cleanings. Washing-up liquid lathers well with a moderate amount. Combi-boilers and white goods face relatively low scaling risk, though fitting a basic inline magnetic conditioner remains sensible. Visitors to the town frequently notice that Stratford's water is considerably softer than the hard chalk belts of the south-east — another of the Bard's birthplace's understated virtues.