The National Resources Defense Council says pollution from storm water runoff and sewage overflows caused 20,000 days' worth of advisories and closures for U.S. beaches last year. The environment group looked at water tests taken by public health agencies .
A Florida beach called Shired Island flunked testing 90% of the testing, making it the nation's filthiest. The Great Lakes Region beat out pretty much everyplace else for the consistently dirtiest beachwater. The group found the cleanest water in Delaware, New Hampshire, Virginia, Arkansas and North Carolina.
To see if your favorite beach makes the list, log onto: http://www.nrdc.org/water/oceans/ttw/titinx.asp.