What is Subtitle D of the Resource Conservation and Recovery Act (US EPA regulations)?

Subtitle D is a set of federal requirements (Subpart 257 and 258, Title 40, Federal Code of Regulations) for public and private landfills receiving municipal solid waste. It sets out minimum standards for design, operation, location, closure and postclosure. United States Environmental Protection Agency (US EPA) adopted the Subtitle D regulations on October 9, 1991 and most provisions became effective on October 9, 1993.