CHICAGO (AP) -- A new report says Illinois is among the top five states with the highest frequency of contaminated beaches.
The Natural Resources Defense Council also says 63rd Street Beach in Chicago is one of the most polluted beaches in the nation.
The study is based on data from the Environmental Protection Agency. It found that there were 591 beach closings and advisory days in Illinois last year. That's a slight increase from the 584 closing days or advisories in 2005.
Chicago Park District spokeswoman Ellen Sargent says the city's aggressive E. coli testing likely results in more closings and advisories.
The report blames storm water washing pollutants into waterways for most of the problem.
Other states cited in the report are Ohio, Indiana, Rhode Island and Minnesota.