Following the dramatic failure of the Kingston, Tennessee wet-coal-ash storage pond, the US federal government initiated a survey of its many similar facilities. The survey details are available. Many of the 584 facilities are more than 30 years old. A 1999 survey by the EPA found that only about one quarter of these structures were lined. Since the Kingston disaster, considerable movements have been made in state legislatures to mandate the use of containment liners, just as they are required for the waste management field. Read more in this article at Solve Climate’s blog.