Midsomer Norton Water Hardness & Quality Report (2026)

Bristol Water supplies Midsomer Norton, a market town in the Somer Valley in Bath and North East Somerset — set in the valley of the River Somer between the Mendip Hills and the south Cotswold fringe, the town that lent its name to the beloved ITV detective series *Midsomer Murders* — from Chew Valley Lake in the Mendip Hills foothills and Mendip Hills spring and limestone aquifer supply, treated at Barrow Water Treatment Works near Barrow Gurney south of Bristol. At 173 mg/L (12.1°Clark), Midsomer Norton's water is moderately hard — consistent with the Carboniferous Limestone (Mendip Hills) and Jurassic Oolite geological character that defines water quality in the Somerset and north Somerset limestone country.

Midsomer Norton sits at the northern edge of the Somerset Coalfield and the foot of the Mendip Hills — a landscape underlain by the Carboniferous Limestone and Dolomite of the Mendip anticline that contributes hard calcium and magnesium-rich groundwater to the region. Bristol Water draws on Chew Valley Lake (fed by the Mendip limestone fringe) and Mendip spring sources to supply the north Somerset communities, yielding moderately hard 173 mg/L with TDS 431.4 mg/L water with a characteristic Mendip limestone bicarbonate hardness quality.

At 173 mg/L, limescale is a noticeable household concern in Midsomer Norton. Kettles benefit from descaling every four to six weeks. The combi-boiler should be fitted with a scale inhibitor and serviced annually. Washing-up liquid requires slightly more product than in softer areas. Taps and shower heads develop moderate limescale deposits within two to three weeks; a monthly wipe with white vinegar keeps fixtures in good condition. The moderately hard Mendip limestone supply is characteristic of the north Somerset and Somer Valley communities in the shadow of the Mendip Hills.