The ban is in effect for the following beaches:
12th Street, 57th Street, 63rd Street, Calumet, Foster,Hartigan Helen Doria, Howard, Humboldt, Lane, Leone, Loyola, Margaret T. Burroughs, Marion Mahony Griffin, Montrose, North Avenue, North Shore, Oak Street, Oakwood, Ohio Street, Osterman, Rainbow, Rogers, South Shore, and Tobey Prinz.
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There is also a Lake Michigan swim ban out of Lake County.
The ban comes after Chicago Fire officials said two people were pulled out of the lake at Fullerton beach around 6:30 a.m. Sunday, where one person was transported to St. Joseph's in critical condition. The other person refused treatment, according to officials.
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The two people were not connected to the triathlon.
Organizers for the Chicago Triathlon also decided to cancel the swimming portion of the race due to hazardous swim conditions.
According to Waukegan Fire officials, crews performed two other water rescues Sunday morning on Lake Michigan where a man was sent to the hospital in critical condition.
The National Weather Service issued a rip current warning for Lake Michigan until Saturday afternoon, but that doesn't mean it's safe to return to the water.