As if shark bites weren't enough to keep you out of the water this summer, the Natural Resources Defense Council has released its list of “dirty beaches” just in time for the Fourth of July weekend.

The group's Jon Devine says when it comes to Galveston's popular beaches, there's good news and bad news.

“In Galveston County, about 5% of samples taken from beaches there were worse than the state's standard for bacteria which indicates whether there is human or animal waste in the water that can make people sick,” Devine tells KTRH News.

“That's a little bit lower than Texas' average which was 9% of samples,” he says.

That bacteria Devine says, can lead to health problems even days after coming in contact with contaminated water.

“It ranges from the annoying to the very severe such as stomach flu, skin rashes, pink eye, ear, nose and throat infections, dysentery and hepatitis, or respiratory and neurological ailments,” he says.

“People don't associate their illness a day or two later with having gone swimming,” says Devine.

Beach goers should stay out of the water if they come across any posted health warnings, cloudy water or foul odor.

A complete list of the NRDC's findings is available on its website.