Under-sink water filter installation in Southampton
Getting an under-sink drinking water filter fitted in Southampton — what it costs, whether you could do it yourself, and where the job stops being DIY.
Hard
Southern Water, Portsmouth Water
Water in Southampton
- Southampton has hard water from Hampshire chalk sources, typically in the 250 to 310 mg/l CaCO₃ range.
- Supply is split between Southern Water and Portsmouth Water depending on the exact location, though both are hard.
- The River Test and River Itchen chalk streams are major local sources and are themselves internationally significant habitats, which makes abstraction a live local issue.
- The city's substantial marine and port sector includes commercial premises with filtration requirements — galley and catering water on vessels among them — that are unusual outside port cities.
- Hampshire's rural fringe includes properties on private supplies where UV and sediment treatment matter, in contrast to the mains-supplied city.
You have hard water — scale protection is worth having.
The World Health Organization notes that water at 200 mg/l or above will produce scale, and that is where this band begins. At this level limescale is a recurring cost rather than an occasional nuisance, and many boiler manufacturers require scale protection to keep the warranty valid. A softener is worth costing out properly.
Who supplies Southampton
Water company boundaries do not follow council boundaries. Check your postcode for the supplier at your address.