Harmful levels of bacteria found in England’s most famous lake

Environment
19 Aug 2025 • 4:04 PM MYT
The Independent
The Independent

The world’s most free-thinking newspaper

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  • New citizen science testing, conducted by the Big Windermere Survey, has revealed "really concerning" pollution levels in Windermere, England's largest lake.
  • The survey, involving 350 volunteers over two and a half years, found harmful bacteria and phosphorus levels that fail water quality standards, with "hotspots" of contamination identified.
  • Much of the lake's shoreline failed bathing water quality standards for illness-causing bacteria during summer, and phosphorus levels, linked to wastewater and agricultural run-off, exceeded expected standards.
  • The Freshwater Biological Association warns that without urgent action, rare species like Arctic char face decline, and states that the evidence demands decisive action to improve water quality.
  • Campaigners are calling for urgent investigation and resolution of pollution hotspots, increased Environment Agency monitoring, investment in wastewater facilities, and continued funding for the Big Windermere Survey.

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