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Water filter installers in West Sussex

Researched and approved by Sebastian, 10 years in water filtration and softening · Last updated 4 August 2026

Find someone to fit water filtration in West Sussex, and find out what is actually worth fitting — West Sussex has very hard water, and that decides most of it.

Very hard

Southern Water, South East Water, Portsmouth Water, SES Water — and they do not all supply the same kind of water, so check your own postcode.

Water in West Sussex

  • West Sussex has hard to very hard water from the South Downs chalk, typically 250 to 330 mg/l CaCO₃.
  • Four companies supply parts of the county, all of them delivering hard water, so the practical advice is consistent even though the supplier is not.
  • The county has a large stock of period and rural property, including a meaningful number on private supplies.
  • Scale protection is standard practice at boiler installation across the county.
  • Coastal West Sussex has a substantial retirement and care sector, which drives commercial filtration demand in care homes and similar premises.

You have very hard water — among the hardest in the UK.

Limescale will be a constant in your home and a real cost in appliance life. A water softener is genuinely worth the investment here and most households who fit one notice the difference within days. At the very least, protect the boiler.

Who supplies West Sussex

HardSouthern WaterVery hardSouth East WaterModerately hardPortsmouth WaterHardSES Water

Water company boundaries do not follow council boundaries. Check your postcode for the supplier at your address.

Water filter installers in West Sussex

No installers listed in West Sussex yet

Our directory is built from businesses that register with us and from listings our editors research and verify. We will not pad it out with businesses we have not checked, so where we have nobody, we say so.

What to do in the meantime

Do you install water filtration in West Sussex? Listing is free and takes about five minutes.

Register your business

What to consider in West Sussex

Based on very hard water, not on what earns us the most.

Softeners

An ion-exchange unit plumbed into the rising main that removes calcium and magnesium entirely, giving genuinely soft water throughout the property.

Scale inhibitors

A compact in-line device that changes how hardness minerals behave so they do not stick as scale, without removing them. Far cheaper and simpler than a softener.

Bypass kits

A valve arrangement that routes water around a softener or filter, so the property keeps its supply while the unit is serviced or removed.

Under-sink filters

A filter housing plumbed into the cold supply under your kitchen sink, feeding either your existing tap or a separate filter tap. The most popular way to get filtered drinking water in a UK home.

Frequently asked questions

Is the water hard in West Sussex?
West Sussex is supplied by Southern Water and South East Water and Portsmouth Water and SES Water, and the water is typically very hard. That is hard enough for limescale to be a genuine issue, so scale protection is worth considering. Check your own postcode for the exact figure.
How much does water filter installation cost in West Sussex?
Indicative UK labour runs from around £120 for a straightforward under-sink filter to £400–£900 for a water softener, with commercial work higher. Local rates vary. We do not set installer prices and take no commission — get three quotes and compare what is included, not just the headline figure.
Do I need a WaterSafe-approved plumber in West Sussex?
Not for every job, but it helps. WaterSafe-approved plumbers can self-certify work that would otherwise need notifying to your water company in advance, and the register is a genuine competence check you can search free. For anything cutting into the rising main — a softener or a whole-house filter — we would use one.

Nearby areas

KentSurreyOxfordBrighton and HoveSouthamptonMilton KeynesReadingBuckinghamshire