Harmful microplastics were found in Lake Michigan and the Chicago River. Should residents worry?

A new study on water pollution in Illinois may make you think twice before jumping into the lake this summer.

According to the Environment Illinois Research & Education Center, the recent study found microplastics across all 31 tested sites, including Lake Michigan and the Chicago River. These tiny pieces of litter may pose a potential health risk to humans and marine life, but what does that really mean for Chicagoans? 

What actually are microplastics?

Microplastics are tiny fragments of plastic smaller than 5 millimeters. Studies on the possible links to illnesses, such as cancer, are being conducted by the government and academic researchers. 

What did this study find in Lake Michigan and the Chicago River?

The study found microplastics, microfibers, microfilms and microfragments across the tested sites. These tiny, sometimes invisible to the naked eye, pieces of litter come from single-use plastics, fast-fashion production and stormwater runoff from nearby factories that use plastic pellets (also found in the waters).

RECOMMENDED: The historic Chicago River Swim is coming back in September

Should I worry?

Not immediately. The presence of plastics and other forms of litter are so widespread that there’s no simple fix. Illinois lawmakers are considering a bill that would require plastics manufacturers to better control runoff stormwater around their factories. The state also introduced a law in 2023 that bans Styrofoam food containers at state buildings. 

Can I still go in the water? 

Yes. Minimizing your contact with the water can, of course, limit the risk of any negative effects, but this study is not a reason to avoid the water completely. That being said, it’s probably wise to avoid submerging yourself in the Chicago River (after all, we all remember the Dave Matthews Band incident of 2004, right?). However, the Chicago River Swim returned last year after nearly a century, which confirms that the water is, technically, safe enough to swim in.

Now what? 

There are a few ways residents can help keep the waters clean. The Environment Illinois Research & Education Center recommends avoiding single-use plastics and fast-fashion trends, and reusing items when possible. The organization has also recommended that the state develop green infrastructure, pass additional producer responsibility laws and halt policies that promote increased manufacture and use of single-use plastics.

Despite these findings, it's still safe to enjoy a dip in the lake. What's better than jumping off the concrete beach on a scorching summer day? Just be sure to pick up your trash before you leave.