What Supreme Court case ruled that ash from municipal waste combustors is subject to RCRA testing requirements?

The correct choice pertains to the case of Chicago vs. the Environmental Defense Fund (EDF), which is significant because it established that ash produced from municipal waste combustors is classified as a solid waste under the Resource Conservation and Recovery Act (RCRA). This ruling mandated that such ash must undergo RCRA testing requirements, thereby enforcing regulations that govern hazardous waste management.

The implications of this ruling are profound, as they enhance environmental protection by ensuring that waste from municipal incineration is properly assessed for hazardous properties before disposal. This case highlights the balance between public health, waste management, and environmental standards.

In contrast, the other cases listed do not pertain specifically to the regulations of ash from municipal waste combustors, focusing instead on different aspects of environmental or regulatory law that do not directly address RCRA testing requirements for waste generated from municipal combustors. Thus, the established precedent in the Chicago vs. EDF case becomes pivotal in understanding regulatory practices concerning waste management in an environmental context.