Organizers estimate about 400 people took the New Years Day plunge at Fairfax Beach.
A report from the Water Quality Office shows that organic contaminants in Bloomington's drinking water have been increasing over the past several years.
If Asian carp make their way into Bloomington's Lake Monroe, the options for getting rid of them would be limited.
Department of Natural Resources officials says Asian carp, an invasive species, are present near Lake Monroe.
Heavy rains caused the lake to rise more than 10 feet above normal levels earlier this summer.
Lake Monroe is sitting at more than 10 feet above its normal pool level.
State biologists say the find is promising evidence that a bald eagle restoration effort decades ago has proven to be a success.
State officials regularly monitor Indiana's recreational areas for high concentrations of blue-green algae.
Indiana Department of Natural Resources officials announced this week that Monroe Lake beaches will not be open in time for Memorial Day Weekend.
Winston Wood was convicted last year of fleeing the scene of a boating accident that resulted in the death of two people and the injury of another.