In December 2014, the U.S. Environmental Protection Agency (EPA) finalized its revised “Definition of Solid Waste” (DSW) Rule, which aims to reestablish hazardous waste restrictions eased by the Bush administration in 2008. Rulemaking on the Definition of Solid Waste. 80 Fed. Reg. 1694 (Jan. 13, 2015) (to be codified at 40 CFR Parts 260 and 261). Hazardous wastes subject to regulation under Subtitle C of the federal Resource Conservation and Recovery Act (RCRA) are a subset of solid wastes. Materials that are not solid wastes are not subject to regulation as hazardous wastes; consequently, the definition of “solid waste” plays a key role in defining the scope of EPA’s authority under RCRA. The statute defines ‘‘solid waste’’ in relevant part as ‘. . .…