Farnborough Water Hardness & Quality Report (2026)

In Farnborough, Hampshire, Affinity Water is the primary supplier, drawing its entire supply from groundwater. This means the water comes from boreholes that tap into underground chalk aquifers, rather than from rivers or reservoirs. While South East Water also serves parts of the wider region, Farnborough residents are mainly supplied by Affinity Water, with the service area covering postcodes such as GU14. The utility treats this groundwater to meet all necessary drinking water standards, ensuring a safe supply without any blending with surface water sources. The underlying watershed is characterized by the extensive chalk aquifer systems found in the South East of England, particularly within the Hampshire Basin.

The water's journey begins in the Cretaceous Chalk formations, a type of white limestone rich in calcium carbonate. This rock type is the main aquifer, allowing rainwater to slowly percolate through it. As the water travels downwards, it dissolves significant amounts of calcium and magnesium minerals from the soluble limestone. This natural process is what gives the water its characteristically hard quality. The geology means that while organic content is low due to the absence of surface runoff, the mineral content is naturally high, a common trait for hydrogeology in this part of England, specifically the Hampshire Downs and North Downs.

This hard water can lead to visible limescale deposits on fixtures like taps, showerheads, and inside appliances such as kettles and heating systems. You might notice reduced efficiency in washing machines and dishwashers over time as mineral buildup affects their performance. To combat this, regular descaling of affected surfaces using common household solutions like vinegar or citric acid can help. Many households find that installing a water softener is the most effective way to protect their appliances from scale damage and improve the lathering of soaps and detergents. South East Water has noted no artificial fluoride is added to its groundwater supplies, consistent with naturally low levels in the region.