Just 17% of England's rivers are judged to be in good health, according to Environment Agency figures.
This is down from 29% with a good ecological status in 2014. The analysis is shocking, say environmentalists.
Problems are caused by over-abstraction and pollution from farms, run-off from roads and effluent from sewage works - as well as invasive species.
The Environment Agency says the figures look bad because the EU's assessment criteria have been tightened.
"Threatens wildlife"
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