The Association of State and Territorial Solid Waste Management Officials released results of a survey recently finding that definitions and management of coal ash vary widely among states, but that most take an active role in regulating the material. The survey, Beneficial Use of Coal Combustion Residuals Survey Report, found that 48 percent of the 46 states that responded have a statutory or regulatory definition of coal ash, and 76 percent said they restrict the beneficial reuse of it.