Beaches from Crystal River, Florida, to Ogunquit, Maine, have been under advisories warning about water quality this week because of elevated levels of bacteria associated with fecal waste. The advisories typically discourage beachgoers from going in the water because the bacteria can cause gastrointestinal illness, rashes and nausea.

There have been closures this week at some of the country's most popular beach destinations, including Keyes Memorial Beach in the Cape Cod village of Hyannis in Barnstable, Massachusetts; Benjamin's Beach on Long Island in Bay Shore, New York; and a portion of the Imperial Beach shoreline near San Diego. Even on the pristine, white sand beaches of Hawaii, the Hawaii State Department of Health is warning of a high bacteria count at Kahaluu Beach Park on the Big Island.

It's a longstanding and widespread problem. Nearly two-thirds of beaches tested nationwide in 2024 experienced at least one day in which indicators of fecal contamination reached potentially unsafe levels, conservation group Environment America said in a report issued this summer.

The group reviewed beaches on the coasts and Great Lakes and found that 84% of Gulf Coast beaches exceeded the standard at least once. The number was 79% for West Coast beaches, 54% for East Coast beaches and 71% for Great Lakes beaches.

The report also said more than 450 beaches were potentially unsafe for swimming on at least 25 percent of the days tested. A key reason is outdated water and sewer systems that allows contamination from sewage to reach the places where people swim, said John Rumpler, clean water director and senior attorney with Environment America.

AP Video shot by Mingson Lau