The Peaks to Portland fundraising swim will go on as scheduled Saturday.
On Thursday about one million gallons of partially-treated sewage from the city's wastewater treatment plant spilled into Casco Bay.
Dave Madore of the Maine Department of Environmental Protection says the primary concern is bacteria in the water.
“The cove itself has a high dilution rate, so with one time behind it, a lot of that is going to move out and away. It may take some time for that to actually move out,” says Madore.