Felixstowe Water Hardness & Quality Report (2026)

Felixstowe, Britain's largest container port town on the Orwell–Stour peninsula at the Suffolk coast, is supplied by Essex & Suffolk Water from the Suffolk Chalk Aquifer and the River Orwell catchment. Chalk boreholes across the south Suffolk chalk dip slope and the Orwell and Deben valleys provide groundwater at 200–230 mg/L, supplemented by surface-water abstraction from the River Orwell treated at Alton Water Treatment Works on the Tattingstone reservoir in south Suffolk. The River Orwell and its tributaries drain the Suffolk chalk upland west of Ipswich, carrying chalk-influenced river water to the estuary. At 222 mg/L Felixstowe's supply is hard chalk water typical of south-east Suffolk — notably similar to Bow (east London, 222 mg/L) and the mid-Suffolk supply belt. The TDS of 504.1 mg/L reflects chalk carbonate chemistry with moderate sulphate content from the Suffolk chalk and overlying Tertiary Crag deposits.

The Cretaceous Chalk of south Suffolk, exposed at the surface in the gentle rolling farmland of the Dedham Vale and dipping toward the coast, is a productive unconfined chalk aquifer beneath 10–30 m of glacial loam and sandy drift. Groundwater at these shallow to moderate depths acquires calcium bicarbonate hardness of 210–230 mg/L — characteristic of unconfined east Suffolk chalk. The Alton Water Reservoir at Tattingstone stores Orwell river water whose chalk-influenced character reinforces the hard water supply to the Felixstowe Peninsula. Suffolk chalk produces consistently hard water throughout the east Suffolk coastal zone.

At 222 mg/L Felixstowe's water is hard and limescale is a persistent domestic feature. Kettles benefit from monthly descaling with a citric acid tablet. Shower screens develop a calcium haze requiring regular white vinegar treatment. Washing-up liquid must be used generously. Combi-boilers and white goods benefit from inline scale inhibitor protection. Felixstowe's position as Europe's busiest container port belies its modest market-town character inland — and the Suffolk chalk water supply that serves both the port workers and the residential town is as unrelentingly hard as the chalk beneath it.