Research and analysis
B1c: Loads discharged to rivers from water company sewage treatment works in England, 1995 to 2024
Updated 17 March 2026
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| year | pollutant | value |
|---|---|---|
| 2024 | Biochemical oxygen demand (BOD) | 23.2 |
| 2020 | Biochemical oxygen demand (BOD) | 20.3 |
| 2015 | Biochemical oxygen demand (BOD) | 20.5 |
| 2010 | Biochemical oxygen demand (BOD) | 21.2 |
| 2005 | Biochemical oxygen demand (BOD) | 23.0 |
| 2000 | Biochemical oxygen demand (BOD) | 29.3 |
| 1995 | Biochemical oxygen demand (BOD) | 36.1 |
| 2024 | Phosphorus | 6.9 |
| 2020 | Phosphorus | 8.3 |
| 2015 | Phosphorus | 9.6 |
| 2010 | Phosphorus | 11.2 |
| 2005 | Phosphorus | 12.8 |
| 2000 | Phosphorus | 22.9 |
| 1995 | Phosphorus | 21.4 |
| 2024 | Ammonia | 4.2 |
| 2020 | Ammonia | 4.2 |
| 2015 | Ammonia | 4.8 |
| 2010 | Ammonia | 5.3 |
| 2005 | Ammonia | 7.3 |
| 2000 | Ammonia | 9.8 |
| 1995 | Ammonia | 17.0 |