Ofwat, the water regulator for England and Wales, has proposed record fines totalling £168m for Thames Water, Yorkshire Water and Northumbrian Water following a major investigation into illegal sewage discharges. Thames Water faces a penalty of £104m, Yorkshire Water £47m, and Northumbrian Water £17m for what the regulator described as a “catalogue of failure” in managing wastewater treatment and storm overflows.
The investigation found that all three companies routinely released sewage into rivers and seas, breaching permits that allow such discharges only in exceptional circumstances. Ofwat stated that the companies failed to upgrade assets, lacked proper oversight, and were slow to understand their obligations, causing harm to the environment and customers.
Nearly 70% of Thames Water’s treatment plants had operational problems, with 16% of its storm overflows operating illegally. At Yorkshire Water, 16% of sewage works had issues and 45% of storm overflows breached permits. The fines come as Thames Water, which serves 16 million customers, struggles with £15.2bn in debt and faces potential government intervention if it cannot secure investment by May 2025.
Ofwat chief executive David Black said the penalties reflect the severity of the failings and the regulator’s determination to enforce cleaner rivers and seas. Environment Secretary Steve Reed welcomed the action, pledging fundamental reform of the water sector through new legislation to cut pollution and protect customers.
The investigation was triggered by public outrage over illegal sewage dumping, which rose by 54% in England in 2023. Campaigners have criticised proposed bill increases of £94 on average over five years, arguing customers should not pay for companies’ failures.
