Mawgan Porth water quality
AMBERdesignated bathing water · · South West Water
Mawgan Porth is a designated bathing water in Cornwall, currently rated AMBER for swimming — A storm overflow discharged within 5 km in the last 48 hours. Falling tide may draw discharge along the shore. Its latest Environment Agency classification is excellent (2025), and 37 storm-overflow spills were recorded nearby in 2025. Below: live risk, recent spills, official samples, rainfall, tides and nearby reports.
Current status
Risk: AMBER A storm overflow discharged within 5 km in the last 48 hours. Falling tide may draw discharge along the shore.
- Active overflows nearby: 0
- Recent overflows (48h): 1
- Rainfall (48h): 33.3 mm
Official EA classification
excellent (2025)
Latest official sample
2026-09-25 — E.coli 10, enterococci 10 cfu/100ml
Latest independent sample
None published
Pollution & environment data
Recent storm overflows nearby (30 days)
- 2026-10-23 06:39 · ended~2.8 km
In the news nearby
- Why some storm overflow alerts may not mean a spill · 2026-08-25
- 3 pollution threats deadlier than climate change in Asia · 2026-10-01
- West Dorset MP attacks water company over drought crisis · 2026-10-21
- Mum of girl , 8 , who died of E . coli slams South West Water over sewage spill revelations · 2026-08-20
- 3 pollution threats deadlier than climate change in Asia · 2026-10-02
- South West Water explains when a sewage spill is not a sewage spill · 2026-08-23
- Hundreds of tourists are falling sick after visiting some of the best beaches in the country , new figures show · 2026-08-08
- Gatwick Airport left with no water , flushing toilets · 2026-07-26
Storm-overflow spills near here, by year (EDM)
Recent spills near here (precise, SWW)
- spill, 84 min2026-10-23 · ~2.8 km
- spill, 23 min2026-10-15 · ~0.3 km
- spill, 11 min2026-09-15 · ~4.8 km
Full spill history near Mawgan Porth
Download CSVEvery storm-overflow discharge Glanmor has recorded within 5 km of Mawgan Porth, newest first.
3 discharge events
| Start | End | Outfall | Distance |
|---|---|---|---|
| 2026-10-23 06:39 | 2026-10-23 08:03 | RIVER MENALHYL (S) | ~2.8 km |
| 2026-02-27 21:40 | 2026-03-06 03:58 | STREAM/ATLANTIC OCEAN (S) | ~2.6 km |
| 2026-02-05 09:27 | 2026-02-05 09:30 | RIVER MENALHYL (S) | ~2.8 km |
13 precise spill records (duration & volume)
| When | Detail | Distance |
|---|---|---|
| 2026-10-23 06:39 | spill, 84 min | ~2.8 km |
| 2026-10-15 20:30 | spill, 23 min | ~0.3 km |
| 2026-09-15 13:34 | spill, 11 min | ~4.8 km |
| 2026-03-02 12:55 | spill, 173 min | ~0.3 km |
| 2026-03-02 12:55 | spill, 173 min | ~0.3 km |
| 2026-02-27 21:40 | spill, 9018 min | ~2.6 km |
| 2026-02-27 21:40 | spill, 9018 min | ~2.6 km |
| 2026-02-27 18:45 | spill, 16 min | ~0.4 km |
| 2026-02-27 18:45 | spill, 16 min | ~0.4 km |
| 2026-02-25 12:14 | spill, 6 min | ~4.8 km |
| 2026-02-25 12:14 | spill, 6 min | ~4.8 km |
| 2026-02-05 09:27 | spill, 3 min | ~2.8 km |
| 2026-02-05 09:27 | spill, 3 min | ~2.8 km |
Water quality — 7-year trend
Water quality improved in 2026: average E. coli was 28% lower than 2025.
| Year | EA classification | Samples | E. coli (geo-mean) | Enterococci (geo-mean) | High readings |
|---|---|---|---|---|---|
| 2019 | — | 12 | 12 cfu/100ml | 12 cfu/100ml | 0 |
| 2020 | — | 3 | 65 cfu/100ml | 17 cfu/100ml | 0 |
| 2021 | — | 20 | 13 cfu/100ml | 15 cfu/100ml | 0 |
| 2022 | — | 20 | 13 cfu/100ml | 13 cfu/100ml | 1 of 20 |
| 2023 | — | 20 | 11 cfu/100ml | 10 cfu/100ml | 0 |
| 2024 | — | 15 | 12 cfu/100ml | 13 cfu/100ml | 0 |
| 2025 | excellent | 20 | 16 cfu/100ml | 15 cfu/100ml | 2 of 20 |
| 2026 | — | 20 | 11 cfu/100ml | 10 cfu/100ml | 0 |
Geometric mean of Environment Agency samples per calendar year (the standard bathing-water statistic). "High readings" are samples at or above 500 E. coli or 200 enterococci cfu/100ml.
Mawgan Porth — frequently asked questions
Is it safe to swim at Mawgan Porth today?
Mawgan Porth is currently rated AMBER: A storm overflow discharged within 5 km in the last 48 hours. Falling tide may draw discharge along the shore. This is guidance only — also check official alerts and use your judgement.
Has there been a sewage spill near Mawgan Porth?
37 storm-overflow spills were recorded near Mawgan Porth in 2025 (EA Event Duration Monitoring), and 3 spill events have been logged nearby so far this year.
What is Mawgan Porth's bathing water classification?
Mawgan Porth is classified excellent for 2025 by the Environment Agency.
Data & provenance
- Last updated
- 2 min ago (2026-10-24 16:00 UTC)
- Sources
- Environment Agency (samples & classification), South West Water (overflows), EA EDM (annual spills), Open-Meteo (rainfall & tide). Full list on about.
- Confidence
- High — official classification, 2 outfalls monitored within 5 km.
- Risk model
- v0.4
- Download
- Sample timeline (JSON) · All beaches (CSV)
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