Do you need a drinking-water filter at all?
For households on a compliant public water supply in England and Wales, the Drinking Water Inspectorate explains that water suppliers are legally required to provide wholesome water, and additional domestic treatment isn't generally required as a health-protection measure.
This does not mean water tastes identical everywhere or that pipework never causes local problems. Water hardness, temperature, household plumbing and personal preferences may influence your experience.
Start with your water supplier
Check the supplier's published water-quality report for your postcode. If you have an unexpected taste, odour, colour or suspected supply problem, contact them for advice rather than relying on a sales claim. Follow any official boil-water or do-not-drink instructions.
When a filter is a preference
Some people choose water treatment to change taste, convenience or the handling of particular substances. If you shop for that reason, make sure the selected device's actual certification and maintenance requirements match the intended purpose.
Choosing less can be the better decision
If you already like your mains water and there is no identified issue, keeping your existing setup may be the best value. We include this advice even though we earn commission from certain retailers.
Sources & verification
Facts below are taken from the linked sources; product information may change. Last editorial check: 13 November 2026. No hands-on product testing was performed.