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Water Quality and Ecology 
The Environment Agency monitors all our rivers, streams and
lakes regularly at over 7,000 locations. River
quality targets are assigned
based on biological, chemical and nutrient testing. Over 70 per cent of
the
rivers of Most people’s first concern is usually sewage but with the new European Water Framework Directive in place all effluent now undergoes at least two treatments before entering a river and, increasingly, a third to make it completely sterile and pure. Any bacteria that do remain are quickly killed by the sun’s UV rays, or eaten up in the micro-foodchain of the river so, the further downstream of the treatment works you are, the cleaner the water will become. Treatment sites are indicated on OS maps as a little cluster of four or six circles by rivers near towns. 
Although the water quality of almost every swim
in the Wild
Swimming book is A or B there’s still much
to be done to make every river and
lake in the
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