Just in time for the Fourth of July, the Natural Resources Defense Council today released its annual beach report.
"Testing the Waters: A Guide to Water Quality at Vacation Beaches" ranks beaches based on pollution.
The group finds that last year (2010) 24-thousand beaches were closed at some point because of bacterial pollution.
That's the second-highest number of closings since tracking began 21 years ago.
The council says polluted waters can cause a variety of medical problems including stomach illnesses, skin rashes and pink eye.
There was some good news too, four beaches received "Superstar Beach" rankings for having perfect scores the past three years.
They are Dewey and Rehoboth Beach in Delaware, Park Point Layfayette Community Club Beach in Minnesota and Hampton Beach State Park in New Hampshire.