MADISON, Wis. -- Last month's floodwaters and the current warm temperatures are causing ideal conditions for the growth of blue-green algae, which in turn has caused the closures of some Madison beaches.

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The algae can be dangerous to people and pets and is prompting a health warning by the Department of Natural Resources, WISC-TV reported.

The three Madison beaches that have been closed since Monday are BB Clarke, Olbrich, and Warner. The beaches were still closed on Friday.

Kirsti Sorsa from Public Health Madison-Dane County said BB Clarke was tested Friday and "might be on its way to clearing" but they decided to keep it closed for another day just as precaution.

She said Warner Park had a large amount of the algae. She said this year has been much worse than past years.

The problem doesn't get much worse than it is right now on parts of Lake Wisconsin in the town of Lodi.

Families that live lakeside on Demynck Road have been putting up with the oppressive odor for two weeks.

Their boats and jet skis look like they are stuck in the mud. But that mud is a several inch-thick layer of blue-green algae, and in their case -- raw sewage that flowed in after the flooding, WISC-TV reported.

The DNR said it can be toxic, and short of waiting it out, there's little hope to remove it.

Barb Knox is sick of the algae. "Here we have this beautiful lake, it's gorgeous, it's usually the land of sky blue waters here, and look at it now," said Knox. "It's just awful, not to mention a health hazard."

"People can be exposed to it through their skin where you can get rashes or an allergic type reaction. Irritation of the eyes, the nose, and the throat," said Susan Graham with the DNR.

If people end up in the water with the algae, they are encouraged by officials to wash it off, and if any was ingested seek medical attention because if toxins appear in the algae it can cause sickness, and even death, WISC-TV reported.

“Coming in contact with or swallowing water with high levels of blue-green algae poses a health risk and can make you sick,” said Dr. Henry Anderson, State Health Officer. “People and pets should avoid swimming in a body of water with a lot of blue-green algae.”

Although there is no requirement for local health departments or physicians to report illnesses related to blue-green algae, each year, the Department of Health Services receives several reports of dog deaths and people with symptoms associated with blue-green algae, according to a DHS press release.