2023 was the worst year on record for stormwater pollution. Stormwater pollution occurs when rain washes pollutants into waterways. These can include litter, chemicals, and raw sewage from overflowing drains. It’s especially bad when treatment plants have insufficient capacity to handle the rainwater.
The Ock area had 747 spillages in 2023, compared to 155 in 2022. Some of those spillages came down the River Ock from places like Wantage(78) and Uffington(86), then went into the River Thames. Others went directly into the River Thames. The Abingdon treatment works had 38 spillages in 2023 and 0 in 2022.
The rivers in the north of England were the worst offenders.
Thanks to Newcomer for pointing out a Guardian article: Englands sewage crisis – How polluted is your local river?. It has a tool for analysing the number of spillages in a year by area. The picture is taken from that tool (all rights reserved).