Canning Town Water Hardness & Quality Report (2026)

Canning Town, in the London Borough of Newham in east London on the lower Thames plain, is supplied by Thames Water from the Lee Valley Reservoirs — Walthamstow and King George — and from the Lee Valley Chalk Aquifer of Hertfordshire. The Lee Valley reservoir chain impounds River Lee water carrying dissolved chalk calcium from the Hertfordshire and Essex chalk catchments, and Thames Water supplements with chalk borehole groundwater from the Lee valley chalk of south Hertfordshire. Canning Town's east London position places it in the Thames Water supply zone strongly influenced by the Lee valley chalk — one of the most productive chalk aquifers in England, producing high dissolved calcium water. The east London supply zone at Newham receives a blend with strong chalk character from the Lee valley chalk network.

Canning Town's hard water — 226 mg/L (15.9°Clark) — reflects the Lee Valley Chalk Aquifer influence on the east London Thames Water supply zone. The chalk of the Hertfordshire Lee valley catchment contributes high dissolved calcium to the east London network. The Drinking Water Inspectorate (DWI) classifies this supply as hard.

Limescale is a persistent household challenge in Canning Town. At 226 mg/L, limescale forms in kettles within two to three weeks and monthly descaling is advisable. Combi-boiler heat exchangers accumulate deposits steadily — annual boiler servicing and an in-line scale inhibitor are recommended. Showerheads, taps, and shower screens develop regular deposits. Washing-up liquid lathers poorly. Using Calgon monthly in the washing machine and maintaining a regular descaling routine is important limescale management for Canning Town households.