WASHINGTON -- The Environmental Protection Agency named Shippingport among 26 communities in 10 states where residents are potentially threatened by coal ash storage ponds similar to one that flooded a neighborhood in Tennessee last year.

The concern is over the Little Blue Run Dam near the Bruce Mansfield Power Plant. An EPA spokesperson said if the dam fails, it could be deadly to the community.

The agency said it will inspect each of the 44 coal ash sites located near communities to make certain they are structurally sound. The sites are being classified as potentially highly hazardous because they are near where people live and not because of any discovered defect.

"The high hazard potential means there will be probable loss of human life if there is a significant dam failure," said Matt Hale, director of EPA's office of research, conservation and recovery. "It is a measure of what would happen if the dam would fail. It is not a measure of the stability of the dam."

North Carolina has the most sites on the list, a dozen.

The largest concentration is near Cochise, Ariz., where there are seven storage ponds.

Burning coal produces ash, which is kept in liquid, known as slurry, in containment ponds or dams. The EPA lists more than 400 such impoundments across the country, but the 44 singled out Monday represent those that are near populated areas, posing a higher danger.

Last year, two days before Christmas, a coal ash pond broke near Kingston, Tenn., sending 5 million cubic yards of ash and sludge across more than 300 acres, destroying or damaging 40 homes. The incident prompted a safety review of storage ponds that hold the waste byproduct near large coal-burning power plants.

The storage ponds hold fly ash, bottom ash, coal slag and flue gas residues that contain toxic metals such as arsenic, selenium, cadmium, lead and mercury, although generally at low concentrations.

Until now, the national coal ash site list has not been provided to the public. Earlier this month the Army Corps of Engineers said it didn't want the locations disclosed because of national security and that it could help terrorists target such facilities. Hale said that issue has been resolved.

The EPA has been to half the 44 sites and expects to issue reports soon, Hale said. The EPA inspections are continuing. The EPA also is reviewing state inspection reports at some of the sites.