WAUPACA (WLUK) – The city of Waupaca is warning people about possible illness from swimming at one of its parks.

According to a post on the City of Waupaca Parks and Recreation Facebook page, people should swim at their own risk in Shadow Lake and South Park beach.

“We are aware of several recent complaints of illness associated with the swim area at South Park Beach,” reads the post. “The complaints are under investigation. At this time it is advised to swim at your own risk. We will provide updates as they are available.”

Several people commented on the post, stating themselves or loved ones were sick after visiting the beach. Comments included people complaining of vomiting, dehydration, and headaches while at the beach.