You'll want to keep a close eye on where you unfold your beach towel and dip your toes in the water this holiday weekend.

As of Wednesday evening, four Door County beaches were closed and another 22 were under advisories because of elevated bacteria levels, according to the Wisconsin Department of Natural Resources' Beach Monitoring website.

Swimming in water with elevated bacteria levels can cause diarrhea, abdominal pain and other illnesses. Bacteria levels can fluctuate over several hours, and because conventional lab analyses take 18 to 24 hours, test results may not reflect current conditions.

Because of this, Door County Public Health's Shauna Blackledge encourages beachgoers to monitor the website and the digital signs at 10 county beaches for real-time updates on whether conditions are safe for swimming.

Last year, Door County beaches recorded 80 advisories and 40 closures.