What the bathing water classifications mean
A bathing water classification is a summary of up to four years of past sampling. It is not a reading of the water in front of you today.
The four classes
Most designated bathing waters in the UK and Ireland get one of four ratings each year. Some do not. Two English sites were not assessed in 2025, and a new site has no rating until it has been sampled long enough. No rating is not good news. It means nobody can tell you.
Excellent is the cleanest class. Sufficient is the minimum legal standard. Poor is below it. A site must clear both bacteria thresholds, so Good on one and Sufficient on the other is rated Sufficient.
What is actually being measured
Two things are measured, and only two: Escherichia coli and intestinal enterococci, gut bacteria that stand in for faecal contamination, human or animal. Chemicals, microplastics and viruses are not measured. Blue-green algae is watched for and warned about separately under regulation 12, but does not feed the rating, so an algae warning and an Excellent rating can sit on the same beach.
The limits are in Schedule 5 of the Bathing Water Regulations 2013, in colony forming units per 100 ml. At the coast, Excellent means 250 E. coli and 100 enterococci, Good means 500 and 200, and Sufficient means 500 and 185. Good and Sufficient share the same E. coli figure on purpose. Excellent and Good are judged on the 95th percentile of samples, Sufficient on the more lenient 90th, so every rating already tolerates bad results.
Four summers of history, not today's water
Regulation 10 uses the season just ended plus the three before it, so a classification rests on up to four bathing seasons. The Environment Agency takes up to 20 samples per English site per season, so at most about 80 bottles stand in for four entire summers, and often fewer.
The rating is old before you read it. England's 2025 classifications were published on 25 November 2025 and stand through 2026. The samples behind them were taken between 2022 and 2025.
Bad results can also be dropped. Where the regulator has set up short-term pollution procedures, regulation 14 lets it leave out samples taken during an incident once a follow-up sample confirms it has ended. Some of the worst water of the year sits outside the rating.
What Poor triggers
When a site is classified Poor, the council that controls it must put up advice against bathing, and the regulator has to identify why the site failed and act on the pollution. The beach does not close.
The sign works one way only. It goes up because of last year's rating, not today's water. An empty noticeboard does not mean the beach was checked this morning.
Five consecutive Poor years used to mean permanent advice against bathing and removal from the list, which cleaned nothing up. A removed site stopped being sampled, so the worst beaches became the ones with no data. That changed in England on 21 November 2025 and in Wales on 1 April 2026. Ministers now act on the regulator's advice about whether a site could reach Sufficient and how long to allow, capped at five years from the classification date.
Sampling differs across the five countries
England and Wales share the 2013 Regulations and a 15 May to 30 September season, sampled by the Environment Agency and Natural Resources Wales. The Environment Agency assessed 449 of England's 451 sites in 2025, rating 297 Excellent and 32 Poor.
Scotland has its own 2008 regulations, a 1 June to 15 September season and a pre-season sample in late May. SEPA samples most sites 18 times a season, remote ones 10 times and sites with a long record of excellent quality 5 times. Fewer samples does not mean cleaner water. It means less evidence.
Northern Ireland has 33 identified bathing waters, with 20 samples per site in 2025. DAERA published the results on 5 November 2025: 24 Excellent, 5 Good, 3 Sufficient and 1 Poor. Northern Ireland does monitor storm overflows. NI Water had 466 monitors running by May 2026 covering 31 of the 33 sites, but it publishes a summary once a year, not live status.
In the Republic of Ireland, councils sample and the EPA reports. Its 2025 results, published on 12 May 2026, put 150 of 153 bathing waters at or above the minimum standard and 120 at Excellent. That is history, not this afternoon. The EPA's 2024 wastewater report says Uisce Eireann still needs better information on how often its sewers discharge, so no spill data is published.
How to use the rating
Use the rating to pick the places you swim regularly, not to pick the day. An Excellent beach can still be filthy after heavy rain.
For today, check the live spill data and any current warning for the beach. Routine sampling stops when the season closes, so an October swim has no fresh sample behind it, although storm overflow monitoring in England and Wales runs all year. Where live data does not exist, nobody knows what is in the water today.
Where this comes from (14 sources)
- legislation.gov.uk (The Bathing Water Regulations 2013, Schedule 5) · The coastal limits of 250/100 for Excellent, 500/200 for Good and 500/185 for Sufficient in cfu per 100 ml, that Good and Sufficient share the same E. coli figure, and that Excellent and Good use a 95-percentile evaluation while Sufficient uses a 90-percentile.
- legislation.gov.uk (The Bathing Water Regulations 2013, regulation 10) · That the assessment uses the season just ended plus the immediately preceding three bathing seasons, so up to four seasons of data, and that fewer seasons may be used in defined circumstances.
- legislation.gov.uk (The Bathing Water Regulations 2013, regulation 12) · That cyanobacterial proliferation (blue-green algae) is dealt with separately from classification, with the regulator required to act immediately and warn the public.
- legislation.gov.uk (The Bathing Water Regulations 2013, regulation 14) · That the short-term pollution disregard applies only where the agency has established relevant procedures for short-term pollution at that bathing water, and only after a verification sample confirms the incident has ended.
- legislation.gov.uk (The Bathing Water Regulations 2013, regulation 13, as amended) · That a Poor classification obliges the local authority to issue advice against bathing and the regulator to identify causes and act; that five consecutive Poor years led to permanent advice against bathing and the site ceasing to be a bathing water; and that the inserted 13(1A) to (1C) put the feasibility advice and the period, capped at five years from publication of the most recent classification, with the agency advising the Minister.
- legislation.gov.uk (The Bathing Water Regulations 2013, Schedule 4) · That the first sample of every bathing season is taken shortly before the season starts, and that samples are taken at intervals of no more than one month through the season, so routine sampling is tied to the season.
- legislation.gov.uk (The Bathing Water (Amendment) (England and Wales) Regulations 2025) · The end of automatic de-designation after five consecutive Poor years and the coming-into-force dates of 21 November 2025 for England and 1 April 2026 for Wales.
- Environment Agency · England's 2025 results published on 25 November 2025: 449 of 451 sites assessed, with two not assessed because they were closed for access reasons, 297 rated Excellent and 32 rated Poor.
- Environment Agency bathing water data service · That the Environment Agency takes up to 20 samples at each English bathing water during the May to September season, the four classes, and that a Poor site displays advice against bathing but the beach remains open.
- Scottish Environment Protection Agency · Scotland's 1 June to 15 September season, the pre-season sample taken in the last fortnight of May, and the 18, 10 and 5 sample tiers by site type.
- DAERA (Northern Ireland) · 33 identified bathing waters, 20 samples per site in 2025, and the results published on 5 November 2025 of 24 Excellent, 5 Good, 3 Sufficient and 1 Poor.
- NI Water · That 466 event duration monitors were operational by May 2026, covering 31 of the 33 designated bathing waters, and that NI Water publishes a 12-month summary to 31 December 2025 rather than live spill status.
- Environmental Protection Agency, Ireland · The 2025 Irish results published on 12 May 2026: 150 of 153 bathing waters at or above the minimum standard and 120 rated Excellent, and the 1 June to 15 September season.
- Environmental Protection Agency, Ireland (Urban Wastewater Treatment in 2024) · That Uisce Eireann needs to improve the information available on how often collecting systems discharge sewage, and that its 2,469 storm water overflows are assessed against standards rather than monitored for spills, so no spill data is published.