Faversham Water Hardness & Quality Report (2026)

Faversham, the ancient market town in the heart of the north Kent fruit-growing country between Sittingbourne and Canterbury on the Swale estuary margin, is supplied by South East Water from the North Kent Chalk Aquifer. The chalk beneath the Faversham area is the Upper Chalk (Turonian–Campanian) of the North Downs dip slope, thinning toward the Swale estuary as it dips gently north-east beneath Tertiary drift. South East Water abstracts from chalk boreholes across the mid-Kent chalk plain — both in the unconfined chalk of the upland and the semi-confined chalk below the Faversham lowland — distributing treated supply from Sittingbourne and Boughton treatment works through the mid-Kent network. At 240 mg/L the supply is hard chalk water typical of north-central Kent — similar to Herne Bay (242.5 mg/L) to the north-east and slightly harder than the west Kent zones closer to the North Downs escarpment. The TDS of 548.2 mg/L reflects chalk carbonate chemistry with modest sulphate from the overlying Tertiary formations.

The Cretaceous Chalk beneath mid-Kent at Faversham extends from the North Downs ridge at 100–150 m OD down to sea level at the Swale estuary. Unconfined chalk groundwater at 20–50 m depth achieves calcium bicarbonate concentrations of 230–250 mg/L — characteristic of the productive north Kent chalk aquifer in the Faversham–Sittingbourne–Canterbury triangle. The proximity to both the North Downs escarpment (recharge zone) and the confined chalk near the estuary means that Faversham taps a predominantly unconfined chalk supply of consistent hardness across the seasons.

At 240 mg/L Faversham's water is hard and limescale management is a consistent domestic task. Kettles benefit from monthly descaling with a citric acid tablet. Shower screens accumulate a calcium haze requiring regular white vinegar treatment. Washing-up liquid must be used generously. Combi-boilers benefit from inline scale inhibitor protection. Faversham's remarkable heritage as an ancient town — its medieval guild hall, the chart gunpowder mills and its creek-side quays — is underpinned by the same North Downs chalk aquifer whose hard water flows from every household tap throughout north Kent's garden county.