Chatteris Water Hardness & Quality Report (2026)

Anglian Water supplies Chatteris, Cambridgeshire, drawing from groundwater boreholes within chalk aquifers. Blended supplies often incorporate water from the Ely area boreholes and the Grafham Water reservoir. Treatment takes place at facilities like the Chatteris Water Treatment Works, where processes include aeration, filtration, chlorination, and fluoridation. This utility serves a vast region, managing water across Norfolk, Suffolk, Cambridgeshire, Essex, and parts of Bedfordshire, Hertfordshire, Lincolnshire, and Northamptonshire. The primary water source is the Chalk Group aquifer, a significant karst system of Cretaceous age.

The bedrock beneath Chatteris consists mainly of chalk formations from the Cretaceous period, specifically the Upper and Middle Chalk. As groundwater travels through these limestone-rich layers, it picks up calcium and magnesium, leading to a characteristically hard water supply. This karst environment, often capped by low-permeability glacial tills and boulder clay, promotes long water residence times, allowing for significant mineral dissolution. This natural geological process is responsible for the mineralised profile common in Anglian Water's service areas, distinguishing it from softer water regions in the UK.

Homeowners in Chatteris will likely notice limescale buildup in appliances such as kettles, boilers, and showerheads, which can decrease their efficiency and shorten their lifespan. Dishwashers and water heaters are particularly susceptible to damage from scale deposits. To combat these issues, regular descaling with household solutions like vinegar or citric acid is advised, alongside annual boiler flushing and the potential installation of scale filters. Given the consistently hard water in this region, installing a whole-house water softener is strongly recommended to protect appliances, improve soap lathering, and extend the functional life of plumbing systems.