Public Health says Nelles Beach and Sherkston Quarry Beach unsafe for swimming.
You'll want to avoid Nelles Beach in Grimsby and Sherkston Quarry Beach in Port Colborne for the time being.
Niagara Region Public Health says Nelles Beach has tested unsafe for swimming, while E.coli was detected in Sherkston Quarry Beach.
During the summer, Public Health regularly tests the water at 19 public beaches.
More information on beach water testing in Niagara can be found here.

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