Moving House? Check Your New Area's Water Quality

When you move house, you think about schools, commute times, council tax, and broadband speeds. Water quality rarely makes the list — but it probably should. The water coming out of your taps will be different in your new home. Sometimes significantly different. It affects how your tea tastes, how quickly limescale builds up in your kettle, whether your skin feels dry after a shower, and — at the more serious end — whether there are contaminants you need to filter out.

A postcode check takes about two minutes and tells you everything you need to know before you move in.

Why water quality varies by postcode

The UK has ten major water companies serving different regions, plus several smaller suppliers. Each draws water from different sources: some rely on upland reservoirs in Wales, Scotland, or the Pennines; others pump water from rivers or treat water from boreholes that tap into chalk aquifers. The geology and environment around those sources determines the natural chemistry of the water — its hardness, trace mineral content, and background levels of agricultural contaminants like nitrate.

Beyond the source water, each company uses different treatment processes, different disinfection approaches, and manages a distribution network of different age and condition. Chlorine levels are set at the treatment works but fall as the water travels through the network — so a home near a treatment works will receive slightly more residual chlorine than one at the far end of the distribution zone.

Then there is the infrastructure at the property itself. A Victorian terraced house in inner London may have lead service pipes connecting it to the main. A modern new-build ten miles away will have copper or plastic plumbing throughout. Same water company, same source water — completely different contaminant profile at the tap.

All of this means that moving house — even a short distance — can result in meaningfully different water. Moving from Manchester to London is not subtle: you will go from relatively soft water (around 60–80 mg/L hardness) to some of the hardest water in the country (250–300 mg/L). But even moving within the same city can cross a water company boundary or put you in a catchment served by a different source.

What to check before moving

There are five things worth looking at for any property you are seriously considering:

Safety score

The TapWater.uk safety score summarises how an area performs across all monitored contaminants — a number from 0 to 100 where 100 means all contaminants are well within regulatory limits. A score below 85 indicates one or more contaminants detected at levels worth investigating. Click through to see exactly what is driving the score.

Contaminants flagged

The postcode report lists any contaminants detected above background levels in monitoring data for the area. Lead, nitrate, PFAS, chlorine, and manganese are the most commonly flagged. Each contaminant links through to a detail page explaining what the levels mean, what the regulatory limit is, and what health effects — if any — are associated with the concentrations found.

PFAS status

PFAS contamination is localised — it clusters around airports, military bases, firefighting training sites, and certain industrial areas. If the property is near one of these, it is worth checking specifically. Our PFAS data covers known hotspots across the UK. A postcode in a clean area will show no PFAS detection; one near a contaminated site may show levels above the new UK guideline.

Hardness level

If you are moving from a soft water area to a hard water area — or vice versa — you will notice immediately. Hard water leaves limescale on kettles, showers, and taps; requires more washing powder and soap; and can affect skin and hair. The postcode report shows hardness in mg/L CaCO3 and classifies it as soft, moderate, hard, or very hard.

Water supplier

The postcode report tells you which water company supplies the area. It is worth knowing who your supplier will be — their customer service record, their current infrastructure investment programme, and whether they are in an area affected by any ongoing compliance issues or enforcement notices from the Drinking Water Inspectorate.

Common surprises when moving house

Certain moves come with predictable water quality changes that are worth knowing in advance.

Moving to London or the South East: limescale

London and the surrounding counties are served by water drawn from rivers and the chalk aquifer, which gives it exceptionally high hardness — typically 250–320 mg/L. If you are moving from the North, Scotland, or Wales, this will be immediately noticeable. Kettles fur up fast. Shower screens streak white. Boiler efficiency drops over time. A water softener or a water descaler (a non-salt alternative that changes how minerals behave rather than removing them) is something many households in these areas invest in.

Moving into a pre-1970 home: lead pipes

Homes built before 1970 — and particularly those built before 1940 — are likely to have lead service pipes running from the street into the property. This is not visible and does not affect the colour, smell, or taste of the water, but it means lead can dissolve into water that has been sitting in contact with the pipe overnight. The risk is highest in soft water areas (where the water is more corrosive) and for households with young children or during pregnancy.

Run the cold kitchen tap for 30 seconds each morning before drinking. Your postcode report will show whether lead has been detected in environmental monitoring for the area. Our lead pipes guide explains the full picture and what pipe replacement involves.

Different taste: chlorine levels by supplier

UK water companies add different amounts of chlorine — within the same regulatory limits — and some use chloramine rather than free chlorine. The taste and smell of tap water varies noticeably between suppliers. Chlorine taste is usually strongest close to the treatment works and fades with distance. A simple carbon jug filter or tap filter removes chlorine effectively and is usually the first thing people buy when they find the taste of new-area water off-putting.

What to do if your new area has concerns

The right approach depends on what the postcode report shows. Different contaminants need different solutions.

Frequently asked questions