The Environmental Protection Agency has released a list of 44 “high hazard potential” coal ash waste dumps across the country. The “high hazard” rating applied to sites where a dam failure would most likely result in a loss of human life, the environmental agency advisory said, but did not assess the structural integrity of the dam or its likelihood of failure.

The list, released late on Monday, was compiled as part of the agency’s inventory of coal ash sites after more than a billion gallons of ash broke through a dam at the Tennessee Valley Authority’s Kingston Fossil Plant west of Knoxville last December. An engineering analysis of the failure, released last week, cited design problems like the height of the ash, among other factors.