LA CROSSE, Wis. -

While most public pools have signs asking people to shower before swimming, a new study shows they may be getting ignored.

The Centers for Disease Control and Prevention did a study on last summer's swimming season and found that feces are frequently introduced into pool water by swimmers.

The study found that almost 60 percent of pool filters tested were positive for fecal contamination, which means swimmers are not showering thoroughly before getting into the water.

The La Crosse County Health Department said it tests public pool water multiple times throughout the year to combat the problem in our area and make sure pools are staying clean.   

"What we really want is people to follow the rules and have safe water and safe equipment. Sometimes when that's not possible, we may issue a citation and we may ask the court to remove the license," said La Crosse County Health Department Environmental Health and Lab Manager Jim Steinhoff.

The La Crosse County Health Department said it's important to stay out of public pools altogether if you are sick.

Experts say while the chlorine can fight most bacteria, it doesn't kill every germ.