August is the best time of the year to take a dip in Lake Michigan, when its waters hover in the balmy upper 60s. Experts say so, and Chicago’s crowded beaches offer proof. But an invisible hazard can quickly turn a sunny day out into a sick night in.
In 2024, over 300 beaches across the Great Lakes closed to visitors or issued swim bans or advisories due to the presence of bacteria in the water — mostly E. coli, from nearby surface runoff or sewer system overflows, especially during heavy rain — according to state and federal data.
Bacteria levels triggered 83 advisories or closures in Illinois last summer, making it the second worst in the Midwest, with 71 in Lake County’s 13 lakefront beaches and 12 across nine beaches in Cook County. As of Thursday, Lake County beaches have had 49 advisories this summer, according to data from the state’s Department of Public Health. There has been at least one beach advisory in Cook County so far, according to Evanston officials.
“What we want, really want, to see is not that people say, ‘Well, that’s just the way it is.’ It shouldn’t have to be this way,” said Nancy Stoner, senior attorney at the Environmental Law and Policy Center, who focuses on clean water issues. “It’s pollution that can be controlled and should be controlled, because people deserve to be able to know that they can swim safely in the Great Lakes.”
In Wisconsin, 90 beaches closed or had advisories between May and September 2024 — representing the most lakefront locations affected — followed by Illinois, Ohio with 67, Michigan with 62, Indiana with 20 and Minnesota with 17, according to data from the U.S. Environmental Protection Agency’s Beach Advisory and Closing Online Notification system, which ELPC analyzed.
Even these numbers are just a starting point. In addition to different frequencies in testing among municipalities, there can also be a lag time by states in filing this information to the U.S. EPA. For instance, the federal agency’s system lists no advisories or closures for Illinois in 2024, data that currently can only be found on the state website. According to a spokesperson, the IDPH attempted a submission, which was rejected because of formatting compatibility issues. The state agency said it continues to work to rectify the situation with the U.S. EPA.
“Beachgoers should be able to rely upon the information provided by U.S. EPA to find out whether the beach they want to go to is safe for swimming,” Stoner said. “They can’t do that right now, and the fact that wrong information is being provided by U.S. EPA makes the situation even worse. U.S. EPA needs to fix this problem right away so that beachgoers don’t unknowingly swim in contaminated water and risk getting sick.”
Known as the BEACON system, it is supported by federal grant funding that allows officials to monitor water quality and bacteria levels. Symptoms in humans exposed to this and similar pathogens can include nausea, diarrhea, ear infections and rashes. According to scientists, each year, there are 57 million cases of people getting sick in the United States from swimming in contaminated waters.
When a certain safety threshold set by the U.S. EPA is exceeded, local officials can decide to issue a swim ban or advisory. Three locations, all north of Chicago, exceeded the EPA’s threshold on at least 25% of days tested last year: North Point Marina Beach, Waukegan North Beach and Winnetka Lloyd Park Beach, according to data from BEACON analyzed in a July report by advocacy nonprofit Environment America.
Chicago tests the water in all its public lakefront beaches every day of the summer, unlike communities in Lake County, which only test four days a week. The report also found that, on the city’s 26 miles of public lakefront during the 2024 season, at least four beaches had potentially unsafe levels between 14% and 21% of the days that the water was tested, including 31st Street Beach, Calumet South Beach, 63rd Street Beach and Montrose Beach.
Most of the funding for testing and monitoring comes from the BEACH Act, or the Beaches Environmental Assessment and Coastal Health Act, which has protected public health in recreational waters across the country since its unanimous passing 25 years ago. Since then, the U.S. EPA has awarded over $226 million in grants for these programs.
“(It) is a small program for a federal program, but a lot in funding” impact, Stoner said.
