Sewage spills in London
Includes overflow assets operated by Thames Water within 5 km of the town centre.
Total spills
1,548
Duration
7,505hrs
Infrastructure
70
Based on the latest Environment Agency storm overflow data
What does 7,505 hours mean?
Combined across all 70 sites in London, that is equivalent to sewage being discharged continuously for 312.7 days non-stop into local waterways (if all reported hours ran back-to-back). In practice, spills are separate events spread across the year.
Top 10 sites by spill count
Sites by severity
70sites
- Critical (>100 spills)1
- High (50–100 spills)5
- Moderate (10–49 spills)42
- Low (<10 spills)22
Site details
Counts use the EA 12–24 hour reporting method for the most recent year with spills, per site. Environment Agency EDM dataset.
| Site name | Water company | Spill count | Duration (hours) |
|---|---|---|---|
| Brixton Storm Relief Sewer | Thames Water | 130 | 915 |
| Brixton Storm Relief Sewer, London | Thames Water | 68 | 488 |
| Brixton And Clapham Sr CSO | Thames Water | 67 | 787 |
| Pauls Pier Combined Sewer Overflow | Thames Water | 66 | 118 |
| Sloane Street, Ranelagh Gdns, Londo | Thames Water | 54 | 243 |
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