Is it safe to swim in the sea in Cornwall?

Generally the water quality is good in Cornwall. After periods of high rainfall, seawater can become contaminated with farmland or urban runoff. There is also the risk of sewage overflows releasing raw, untreated human waste into the ocean.



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Hannah continues: “The clarity and turquoise colour in west Cornwall compared to say the North Sea or Bristol Channel is also because of the heavy sand particles which sit on the seabed, and lack of sediment swirling around in the water column.”

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When surfer William Howells returned to the sea a year after suffering a heart attack, the swell was not the main thing on his mind. It was the smell. He said a wave of sewage releases in July left Harlyn Bay, Cornwall, just smelling of excrement.

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Cornwall, unitary authority and historic county, southwestern England, occupying a peninsula jutting into the Atlantic Ocean.

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Top 10 Unexpectedly Clear Waters in the UK
  • Cornwall Beaches, England. ...
  • East Sussex, England. ...
  • Luskentyre, Isle of Harris, Scotland. ...
  • Fairy Pools, Isle of Skye, Scotland. ...
  • Rhossili Bay, Swansea, South Wales. ...
  • Blackpool Sands, Devon, England. ...
  • Marloes Sands, Pembrokeshire, Wales. ...
  • Porthcurno, Cornwall, England.


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Cornwall is England's most south-westerly county that built its reputation on fishing, mining and farming (and a bit of smuggling, too). Known to Cornish speakers as Kernow, it's now the place to come if you seek isolated craggy coves, wide expanses of smooth sand or wild, rugged moorland.

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What's the climate in Cornwall? The weather in Cornwall is relatively mild and generally warmer than anywhere else in the country. This makes Cornwall a popular destination to travel to at any time of the year.

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Hannah continues: “The clarity and turquoise colour in west Cornwall compared to say the North Sea or Bristol Channel is also because of the heavy sand particles which sit on the seabed, and lack of sediment swirling around in the water column.”

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