Ontario Beach Park in Charlotte is among one of the dirtiest in the country. That's according to a report released on Wednesday by the Natural Resources Defense Council. The national report analyzes government data on beachwater testing results from 2011 at more than 3,000 beaches nationwide. The report says some of the nation's beachwater continued to suffer from serious contamination and pollutants by human and animal waste. Ontario Beach Park is considered one of the nation's 15 "repeat offenders." Those include beaches that have stood out as having persistent contamination problems.