The Drinking Water Inspectorate, Environment Agency, Natural Resources Wales and Ofwat have published their first joint Water Industry Performance Insights report, combining evidence on drinking water quality, environmental performance and customer service in England and Wales to strengthen transparency and oversight. Drinking water tests met required standards in 99.97% of cases, while internal sewer flooding fell by 43% in recent years. Leakage declined over the longer term, but further reductions are needed as pressure on water resources increases. Supply interruption performance improved, although some customers continued to experience lengthy disruptions. Pollution remained a concern, with 2,991 incidents recorded in 2025, including 84 serious incidents. Companies completed 93.7% of required environmental improvement actions on time, leaving 142 planned actions undelivered. Regulators will use financial penalties, enforcement action and improvement plans to address failures and oversee more than £104 billion of planned investment between 2025 and 2030.