Monthly watchdog
Cornwall sewage report card
June 2026 — recorded storm-overflow activity across Cornwall.
337
Spill events
288
Outfalls that spilled
+403%
vs previous month
67
Previous month's events
In June 2026, Glanmor recorded 337 storm-overflow spill events across Cornwall from 288 separate outfalls. That's 403% more than the previous month. Figures are from South West Water's near-real-time monitoring and may be revised.
Glanmor's continuous monitoring began in late June 2026, so this first month is partial.
Worst offenders in June 2026
| # | Outfall / receiving water | Spill events |
|---|---|---|
| 1 | STONEHOUSE CREEK VIA SWS (EST) | 8 |
| 2 | ATLANTIC OCEAN | 5 |
| 3 | STREAM (S) | 5 |
| 4 | COLES STREAM (S) | 4 |
| 5 | TRIBUTARY OF RIVER TORRIDGE(S) | 4 |
| 6 | RIVER KENSEY | 4 |
| 7 | TRIB OF RIVER TORRIDGE | 3 |
| 8 | RIVER SEATON (S) | 3 |
| 9 | RIVER DERRIL (S) | 3 |
| 10 | RIVER KENSEY (S) | 3 |
See the worst-polluters leaderboard for annual totals, or download the data.
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Journalists & campaigners: these figures are free to cite (please link back). Each month has a permanent link. Data extracts on request.
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