Research and analysis
B2: Serious pollution incidents to water in England, 2001 to 2023
Updated 1 December 2025
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| year | category | value |
|---|---|---|
| 2001 | Category 1 (Major) incidents | 98 |
| 2002 | Category 1 (Major) incidents | 76 |
| 2003 | Category 1 (Major) incidents | 83 |
| 2004 | Category 1 (Major) incidents | 83 |
| 2005 | Category 1 (Major) incidents | 73 |
| 2006 | Category 1 (Major) incidents | 75 |
| 2007 | Category 1 (Major) incidents | 56 |
| 2008 | Category 1 (Major) incidents | 59 |
| 2009 | Category 1 (Major) incidents | 66 |
| 2010 | Category 1 (Major) incidents | 43 |
| 2011 | Category 1 (Major) incidents | 41 |
| 2012 | Category 1 (Major) incidents | 41 |
| 2013 | Category 1 (Major) incidents | 43 |
| 2014 | Category 1 (Major) incidents | 53 |
| 2015 | Category 1 (Major) incidents | 51 |
| 2016 | Category 1 (Major) incidents | 51 |
| 2017 | Category 1 (Major) incidents | 42 |
| 2018 | Category 1 (Major) incidents | 69 |
| 2019 | Category 1 (Major) incidents | 41 |
| 2020 | Category 1 (Major) incidents | 47 |
| 2021 | Category 1 (Major) incidents | 47 |
| 2022 | Category 1 (Major) incidents | 43 |
| 2023 | Category 1 (Major) incidents | 56 |
| 2001 | Category 2 (Significant) incidents | 736 |
| 2002 | Category 2 (Significant) incidents | 693 |
| 2003 | Category 2 (Significant) incidents | 618 |
| 2004 | Category 2 (Significant) incidents | 505 |
| 2005 | Category 2 (Significant) incidents | 495 |
| 2006 | Category 2 (Significant) incidents | 461 |
| 2007 | Category 2 (Significant) incidents | 380 |
| 2008 | Category 2 (Significant) incidents | 314 |
| 2009 | Category 2 (Significant) incidents | 361 |
| 2010 | Category 2 (Significant) incidents | 294 |
| 2011 | Category 2 (Significant) incidents | 320 |
| 2012 | Category 2 (Significant) incidents | 250 |
| 2013 | Category 2 (Significant) incidents | 324 |
| 2014 | Category 2 (Significant) incidents | 307 |
| 2015 | Category 2 (Significant) incidents | 274 |
| 2016 | Category 2 (Significant) incidents | 266 |
| 2017 | Category 2 (Significant) incidents | 220 |
| 2018 | Category 2 (Significant) incidents | 245 |
| 2019 | Category 2 (Significant) incidents | 225 |
| 2020 | Category 2 (Significant) incidents | 270 |
| 2021 | Category 2 (Significant) incidents | 282 |
| 2022 | Category 2 (Significant) incidents | 264 |
| 2023 | Category 2 (Significant) incidents | 322 |