Treyarnon Bay water quality
GREENdesignated bathing water · · South West Water
Treyarnon Bay is a designated bathing water in Cornwall, currently rated GREEN for swimming — No recent overflow, low rainfall, no high samples. Its latest Environment Agency classification is excellent (2025), and 152 storm-overflow spills were recorded nearby in 2025. Below: live risk, recent spills, official samples, rainfall, tides and nearby reports.
Current status
Risk: GREEN No recent overflow, low rainfall, no high samples.
- Active overflows nearby: 0
- Recent overflows (48h): 0
- Rainfall (48h): 2.0 mm
Official EA classification
excellent (2025)
Latest official sample
2026-06-22 — E.coli 10, enterococci 10 cfu/100ml
Latest independent sample
None published
Pollution & environment data
Recent storm overflows nearby (30 days)
- 2026-06-18 08:45 · ended~1.5 km
- 2026-06-17 07:26 · ended~2.3 km
In the news nearby
- South West Water owner says firm must rebuild trust after parasite outbreak · 2026-06-10
- South West Water owner says firm must rebuild trust after parasite outbreak · 2026-06-10
- South West Water owner says firm must rebuild trust after parasite outbreak · 2026-06-10
- South West Water owner says firm must rebuild trust after parasite outbreak · 2026-06-10
- South West Water owner admits firm must learn lesson from Devon parasite outbreak · 2026-06-10
- Antibiotic residues in wastewater found to fuel drug resistance : study - Xinhua · 2026-06-09
- South West Water owner says firm must rebuild trust after parasite outbreak · 2026-06-10
- South West Water owner says firm must rebuild trust after parasite outbreak · 2026-06-10
Storm-overflow spills near here, by year (EDM)
Recent spills near here (precise, SWW)
- spill, 2 min2026-06-18 · ~1.5 km
- spill, 2 min2026-06-18 · ~1.5 km
- spill, 17 min2026-06-17 · ~2.3 km
- spill, 17 min2026-06-17 · ~2.3 km
Full spill history near Treyarnon Bay
Download CSVEvery storm-overflow discharge Glanmor has recorded within 5 km of Treyarnon Bay, newest first.
3 discharge events
| Start | End | Outfall | Distance |
|---|---|---|---|
| 2026-06-18 08:45 | 2026-06-18 08:47 | TREYARNON STREAM | ~1.5 km |
| 2026-06-17 07:26 | 2026-06-17 07:43 | MOTHER IVEYS BAY (C) | ~2.3 km |
| 2026-03-02 14:43 | 2026-03-03 01:13 | TREVONE BAY | ~3.5 km |
8 precise spill records (duration & volume)
| When | Detail | Distance |
|---|---|---|
| 2026-06-18 08:45 | spill, 2 min | ~1.5 km |
| 2026-06-18 08:45 | spill, 2 min | ~1.5 km |
| 2026-06-17 07:26 | spill, 17 min | ~2.3 km |
| 2026-06-17 07:26 | spill, 17 min | ~2.3 km |
| 2026-03-03 12:25 | spill, 10 min | ~2.5 km |
| 2026-03-03 12:25 | spill, 10 min | ~2.5 km |
| 2026-03-02 14:43 | spill, 630 min | ~3.5 km |
| 2026-03-02 14:43 | spill, 630 min | ~3.5 km |
Water quality trend
Treyarnon Bay — frequently asked questions
Is it safe to swim at Treyarnon Bay today?
Treyarnon Bay is currently rated GREEN: No recent overflow, low rainfall, no high samples. This is guidance only — also check official alerts and use your judgement.
Has there been a sewage spill near Treyarnon Bay?
152 storm-overflow spills were recorded near Treyarnon Bay in 2025 (EA Event Duration Monitoring), and 3 spill events have been logged nearby so far this year.
What is Treyarnon Bay's bathing water classification?
Treyarnon Bay is classified excellent for 2025 by the Environment Agency.
Data & provenance
- Last updated
- 3 h ago (2026-06-29 14:00 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, 3 outfalls monitored within 5 km.
- Risk model
- v0.3
- Download
- Sample timeline (JSON) · All beaches (CSV)
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