Lake Windermere in the Lake District is a UNESCO world heritage site visited by millions of people a year but much of it is polluted with the bacteria found in sewage - according to a survey by volunteers.
(Subscribe: https://bit.ly/C4_News_Subscribe)
Citizen scientists took more than a thousand samples from the lake over two and a half years and found levels of harmful bacteria and phosphorous which failed water quality standards.
The government said it was committed to ending sewage pollution in Windermere entirely.
-----------------------
Follow us:
Facebook - https://www.facebook.com/Channel4News/
Twitter - https://twitter.com/Channel4News
TikTok - https://www.tiktok.com/@c4news
Instagram - https://www.instagram.com/channel4news/