Cornwall water data & downloads

Everything Glanmor collects, refreshed daily from public sources + citizen reports. Updated just now.

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Beaches (CSV)Beaches (JSON)Spill events (CSV)Official samples (CSV)Reports & signals (JSON)

Open data under the originating licences (see sources). Please attribute Glanmor and the original source. For bulk extracts or an API, get in touch.

90
Beaches
8,433
EA samples (7 yrs)
604
Outfalls
620
Overflow events
8,482
Rainfall readings
10,800
Tide readings
3,954
Data signals
0
Citizen reports

Storm-overflow spills per year (Cornwall, EDM)

Overflow events per month (last 12 months)

Most spills in 2025 (EDM)

  1. 198 spills — TOWN QUAY PUMPING STATION
  2. 167 spills — ST NEOT STW
  3. 165 spills — ALTARNUN STW
  4. 164 spills — HAREWOOD ROAD CSO
  5. 159 spills — CHACEWATER STW
  6. 153 spills — 39 ST MICHAELS COMBINED SEWER OF
  7. 148 spills — DELABOLE WASTEWATER TREATMENT WORKS
  8. 147 spills — PRAZE AN BEEBLE STW
  9. 141 spills — GWENNAP WASTEWATER TREATMENT WORKS
  10. 134 spills — BRIDGE PS / CSO / EO

Recent overflow events (14d)

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