Monthly watchdog
Cornwall sewage report card
August 2026 — recorded storm-overflow activity across Cornwall.
571
Spill events this month
130
Outfalls that spilled
-11%
vs previous month
641
Previous month's events
In August 2026, Glanmor recorded 571 storm-overflow spill events across Cornwall from 130 separate outfalls. That's 11% fewer than the previous month. Figures are from South West Water's near-real-time monitoring and may be revised.
Worst offenders this month
| # | Outfall / receiving water | Spill events |
|---|---|---|
| 1 | RIVER KENSEY (S) | 30 |
| 2 | RIVER TORRIDGE | 24 |
| 3 | PENRYN RIVER(E) | 23 |
| 4 | LOOE RIVER (HARBOUR) (E) | 19 |
| 5 | RIVER FOWEY ESTUARY(E) | 18 |
| 6 | FOWEY ESTUARY (E) | 18 |
| 7 | RIVER TAMAR (E) | 17 |
| 8 | RIVER FOWEY ESTUARY (E) | 17 |
| 9 | TRIB OF LITTLE MERE RIVER | 12 |
| 10 | RIVER KENSEY | 12 |
See the worst-polluters leaderboard for annual totals, or download the data.
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