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Thames Super Sewer Clears Pollution, Revives River
12 Oct
Summary
- Sewage overflow health risks dropped from 269 to 38 days.
- The Thames, once biologically dead, is now recovering.
- Aquatic wildlife conditions have improved in the tidal Thames.
The Thames super sewer has demonstrably improved the health of London's iconic river. A recent report indicates a dramatic reduction in health risks associated with sewage overflows, falling from 269 days in 2023 to only 38 days in 2025. This vital infrastructure project has led to the river's recovery, transforming it from a state once described as 'biologically dead' to one showing significant signs of life.
The 16-mile tunnel, capable of holding 600 Olympic-sized swimming pools, now ensures cleaner water is pumped to the Beckton treatment works. River users can anticipate greater confidence on the water as a result. Conditions for fish and other aquatic species in the tidal Thames have also seen a marked improvement since the super sewer became operational, signaling a positive shift for the ecosystem.
