Colchester Beach is closed.
The Windsor-Essex County Health Unit closed the beach on Monday after discovering a blue green algae bloom.
Health Inspection Manager Mike Tudor says an inspector went to the beach and found the bloom primarily in the harbour area.
He says swimmers and boaters are being asked to stay away.
"The whole beach should be closed off to the public," says Tudor. It's not recommended that anyone go in that water."
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Tudor believes the beach will be closed for the reminder of the week.
"I'll have the inspector return this week and just do an assessment probably prior to the weekend to see if in fact conditions have changed and are favourable to remove the closure order," says Tudor.
Blue Green algae bloom is described as a bacteria that can produce a toxin.