And the latest figures are alarming: only 14% of England's rivers are classified as being of 'good' ecological status, according to a government report published in January 2022.
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In a people-powered study of pollutant levels in UK freshwater sites, the River Dart was the only one, out of 48, to pass all five parameters. The river runs 75km from Dartmoor and into the sea at Dartmouth.
Sewage spills and agricultural pollution are the leading causes of dirty rivers. And the latest figures are alarming: only 14% of England's rivers are classified as being of 'good' ecological status, according to a government report published in January 2022.
The establishment of embankments and sewage system managed to make the Thames river no longer emit a foul smell. However, the condition of the water still could not support any kinds of life form.
If there's a lot of rain, there's the risk of these pipes becoming overwhelmed and the sewage backing up into people's houses. To lower that risk, instead of all the raw sewage ending up at the water treatment plant, some of it is pumped through storm overflows and into the sea or rivers.
It's a common misconception that because the Thames is brown and murky, it must be dirty and polluted. But this isn't the case! All estuaries are hugely important for sediment transportation, so the reason the Thames is brown is because of the huge amounts of sediment and mud naturally transported with the daily tides.
In England and Wales, a “right to roam” law means most lakes and rivers are open to swimming but there are some exceptions so it is important to confirm that you have access before you start swimming.