Aylesbury Water Hardness & Quality Report (2026)

Thames Water Utilities Limited supplies Aylesbury, Buckinghamshire, South East England with water drawn from groundwater boreholes. These wells tap into the Chalk aquifer beneath the Chiltern Hills, with significant abstraction points at the Waddesdon and Aylesbury borehole fields. The water then undergoes treatment at facilities such as the Aylesbury Water Treatment Works. Here, the raw groundwater is treated through processes including aeration, filtration, chlorination, and fluoridation before it's distributed to customers. The supply originates from the Thames Valley groundwater catchment, specifically the Chiltern Hills sub-basin within the Upper Thames watershed.

The primary aquifer is the Cretaceous Chalk Group, a fractured and dissolved limestone formation known for its karstic nature. Rainwater percolates through this fissured bedrock, where it dissolves significant amounts of calcium carbonate from the limestone. This prolonged interaction with the rock enriches the groundwater with dissolved minerals, resulting in a moderately mineralised profile. This characteristic is typical of hard groundwater supplies found in southern England, differing from the softer waters found in moorland rivers.

This moderately hard water can contribute to limescale buildup in appliances like kettles, boilers, and washing machines, potentially reducing their efficiency and lifespan. Homeowners might notice white deposits on fixtures and scum on taps. Simple descaling with household solutions like vinegar or citric acid, along with regular filter cleaning, can help manage these deposits. For persistent issues, installing a water softener is often recommended to protect plumbing and improve how well soap lathers. Thames Water maintains the water's pH between 7.0-8.5, adhering to DWI standards for safety and quality.