Chafford Hundred Water Hardness & Quality Report (2026)

Essex and Suffolk Water (part of Northumbrian Water Group) supplies Chafford Hundred, a planned residential community built on the former Ockendon Quarry in Thurrock, Essex — a distinctive modern township with award-winning sustainable design on the M25 corridor near Lakeside shopping centre — from the Essex Chalk aquifer (Cretaceous Chalk) and Hanningfield Reservoir in mid-Essex, treated at Hanningfield Water Treatment Works near South Hanningfield. At 240.5 mg/L (16.9°Clark), Chafford Hundred's water is hard, consistent with the chalk-dominated supply that characterises the Essex and Suffolk Water south Essex distribution network.

Chafford Hundred sits in the Thurrock chalk country where the North Downs Chalk extends northward beneath the Thames into Essex. Essex and Suffolk Water draws on the Essex Chalk aquifer and Hanningfield surface reservoir to supply south Essex, with the chalk-dominated supply delivering 240.5 mg/L with TDS 582.3 mg/L to Chafford Hundred — substantially softer than nearby Tilbury (312.5 mg/L, TDS 878.1 mg/L), reflecting a higher surface reservoir dilution fraction in the Chafford Hundred distribution sub-zone.

At 240.5 mg/L, limescale is a persistent household challenge in Chafford Hundred. Kettles should be descaled monthly. The combi-boiler benefits from a fitted scale inhibitor and annual professional servicing. Washing-up liquid requires more product per wash than in softer areas. Taps and shower heads develop visible white limescale deposits within one to two weeks; a fortnightly wipe with white vinegar or a proprietary descaling product keeps fittings clean and prevents chalk staining from building up permanently in this hard Essex chalk-blend Thurrock supply zone.