Burnham Water Hardness & Quality Report (2026)

Affinity Water supplies Burnham, a large village in south Buckinghamshire near Slough — home of the National Trust's Burnham Beeches ancient woodland, one of the finest ancient beech forests in England — from Chiltern Chalk aquifer boreholes in the south Buckinghamshire chalk zone, treated at Iver Water Treatment Works near Iver. At 299 mg/L (21.0°Clark) and a TDS of 875 mg/L, Burnham's water is extremely hard — among the hardest in Buckinghamshire — consistent with the deeply saturated Chiltern Chalk aquifer that delivers exceptionally mineralised groundwater to the Affinity Water south Buckinghamshire distribution zone.

Burnham lies in the south Buckinghamshire chalk plateau where the Upper Chalk (Cretaceous) is freely recharged from the Chiltern Hills above. Affinity Water draws on chalk boreholes in the Colne Valley and south Buckinghamshire chalk zone to supply the Burnham area, delivering 299 mg/L with TDS 875 mg/L — hard chalk water approaching the 300 mg/L threshold, consistent with the very hard Chiltern chalk belt of south Buckinghamshire from Beaconsfield through Burnham to Iver that is supplied from the same productive Affinity Water chalk zone.

At 299 mg/L, limescale is an extreme and persistent household problem in Burnham. Kettles must be descaled weekly to prevent rapid element failure. The combi-boiler faces very high risk of premature breakdown without a properly fitted, annually replaced scale inhibitor and regular professional servicing. Washing-up liquid barely lathers without very generous quantities of product. Taps, shower heads, and basin fittings develop heavy chalk encrustation within days; a weekly descaling with white vinegar or a proprietary product is essential. A whole-house water softener is very strongly recommended for all Burnham households.