How Hard Is the Water in Brighton & Sussex?

If you've ever noticed white chalky deposits on your taps, a scummy film on your morning tea, or your skin feeling dry after a shower, you're experiencing the effects of hard water. Sussex is one of the hardest water regions in the whole of the UK — and most residents have no idea just how bad it is.

What is water hardness?

Water hardness refers to the concentration of dissolved calcium and magnesium minerals in your tap water. These minerals are picked up as rainwater filters through chalk and limestone rock — which is exactly what sits beneath much of Sussex and the South Downs. Water hardness is measured in milligrams per litre (mg/l), often expressed as parts per million (ppm). The UK Drinking Water Inspectorate classifies anything above 200mg/l as hard, and above 300mg/l as very hard.

Water hardness levels across Sussex

Here's how the major towns in Sussex compare:

As you can see, every major town in Sussex sits well above the UK average — and most are in the 'very hard' category.

Why does it matter?

Hard water is more than just an inconvenience. Over time, calcium deposits — known as limescale — build up inside your boiler, pipes, washing machine, dishwasher and kettle. This has real consequences: a 1.5mm layer of limescale on a boiler heat exchanger can reduce its efficiency by up to 12%, meaning higher energy bills. Appliances also wear out faster, with washing machines and dishwashers typically lasting several years less in hard water areas. On top of that, hard water reacts badly with soap, requiring more detergent, leaving residue on skin and hair, and causing that characteristic scummy bath ring.

What can you do about it?

The most effective long-term solution is a water softener. A water softener uses a process called ion exchange to replace the calcium and magnesium ions with sodium ions — producing genuinely soft water throughout your home. The results are immediate and noticeable: no limescale, better lathering soap, softer skin and hair, cleaner appliances, and lower energy bills.

Simply Softeners installs eco-friendly water softening systems across East and West Sussex, including Brighton, Worthing, Crawley, Horsham, Chichester and Eastbourne. We offer a free home survey with no obligation, and all installations come with a 5-year warranty.