Sewage spills in Wales exceeded 800,000 hours last year, report claims

Sewage spills in Wales exceeded 800,000 hours last year, report claims

New data reveals that in 2025, sewage was released into rivers, lakes, and coastal waters across Wales for over 800,000 hours. According to the environmental charity Surfers Against Sewage, which reviewed information from Welsh water companies, there were upwards of 100,000 incidents of sewage discharge throughout the year—averaging roughly one release every five minutes.

Although these figures represent a decrease compared to the previous year, when the total discharge time exceeded 970,000 hours, concerns remain. Natural Resources Wales (NRW), the regulatory body, stated it has enhanced its regulatory measures by increasing monitoring efforts and tightening guidelines, alongside overseeing major investments made by water companies aimed at improving the environment.

The charity Surfers Against Sewage attributes part of the reduction in discharges to the dry weather experienced during the summer months of 2025. However, it highlighted ongoing challenges related to insufficient investment and weak enforcement actions. Their annual report notes that since 2019, there have been 992 sickness cases linked to sewage exposure in Wales, with 215 reported in 2025 alone. These illnesses have resulted in more than 2,200 lost workdays.

Further, sewage pollution affected designated bathing waters in Wales for a total of 35,669 hours during the year. For example, at Llyn Padarn in Gwynedd, a lake officially classified as having “excellent” water quality, sewage discharges persisted for 1,614 hours. While regulations permit some sewage release during heavy rainfall to prevent system overloads, environmental groups remain alarmed by the potential harm to wildlife and the health risks posed to swimmers.

Giles Bristow, chief executive of Surfers Against Sewage, described the statistic of a discharge every five minutes as “shocking.” He also observed that at 90 locations identified by authorities as good swimming spots, sewage pollution occurred for more than 4,000 hours. Bristow remarked, “It’s a really terrible picture that we’re seeing of continued underinvestment and a lack of enforcement to ensure that this isn’t happening. People’s lives and their health are being put at risk when they go to enjoy these amazing places.”

In response, Welsh Water acknowledged the public concerns and confirmed plans to invest a record £2.5 billion over the next four years. The company emphasized its responsibility to protect water quality and admitted that improvements are necessary. It stated, “In line with Welsh government policy, we are prioritising the overflows causing the greatest environmental harm.”

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