About Glanmor
Cornwall sea-water testing, swim safety, and pollution evidence.
Glanmor collates publicly available water-quality and pollution data for Cornwall — Environment Agency samples, storm-overflow monitoring, rainfall, tides and news — alongside citizen reports, so anyone can see what's happening in the water and build an evidence picture.
Glanmor is an independent, community-run project, built and maintained by the Glanmor team. It is not affiliated with the Environment Agency, South West Water or any public body, and is not funded by any water company.
Independently run and self-funded · get in touch.
How the risk rating works
Each beach is rated as a guidance indicator only, refreshed continuously:
- RED — a storm overflow is actively/recently discharging within 5 km, or a recent sample showed high bacteria.
- AMBER — recent rainfall (≥8 mm/48h) or a recent overflow nearby.
- GREEN — no recent overflow, low rainfall, no high samples.
- GREY — not enough data.
Illness reports get a transparent pollution-correlation score (out of 100) across pollution proximity, water-test support, rainfall, illness timing, medical support and corroboration — collation only, never a determination of legal causation.
Data sources & attribution
| Source | Used for | Licence |
|---|---|---|
| Environment Agency Bathing Water Quality | Official samples (7 yrs), classifications, beach locations | Open Government Licence |
| South West Water — WaterFit Live | Live overflow status, precise spill events, pollution-risk forecasts | SWW open data |
| The Rivers Trust — EDM annual returns | Per-outfall spill counts/durations 2020–2025 | CC-BY |
| Open-Meteo | Rainfall & tide data | CC-BY 4.0 |
| GDELT | News reports | Open |
| POOPy / sewage-map (A. Lipp) | Downstream river-impact modelling | GPL-3.0 |
| OpenStreetMap | Map tiles | ODbL |
Data refreshes daily (full sweep) with live overflow status every ~15 minutes. Figures are community-collected and may be incomplete or delayed.
Do not rely solely on this website for health decisions. Check official alerts and use your own judgement. Seek medical advice if you are unwell. Glanmor collects and collates water-quality and pollution data alongside citizen reports, to make what's happening in Cornwall's waters visible. It does not provide medical advice — if you are unwell, seek medical advice. Community-collected data may be incomplete or unverified.