Sewage spills in Southampton
Includes overflow assets operated by Southern Water within 5 km of the town centre.
Total spills
340
Duration
2,555hrs
Infrastructure
20
Based on the latest Environment Agency storm overflow data
What does 2,555 hours mean?
Combined across all 20 sites in Southampton, that is equivalent to sewage being discharged continuously for 106.5 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
20sites
- Critical (>100 spills)0
- High (50–100 spills)2
- Moderate (10–49 spills)5
- Low (<10 spills)13
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) |
|---|---|---|---|
| Portswood WWTW | Southern Water | 91 | 994 |
| Slowhill Copse WWTW | Southern Water | 84 | 970 |
| Chapel Wharf Wps | Southern Water | 40 | 336 |
| Sirdar Road Southampton CSO | Southern Water | 33 | 81 |
| Millbrook WWTW | Southern Water | 23 | 75 |
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