Which agency is primarily responsible for regulating hazardous materials in Indiana?

The Indiana Department of Environmental Management (IDEM) is the primary agency responsible for regulating hazardous materials within the state of Indiana. This agency is tasked with ensuring compliance with federal and state regulations concerning environmental protection, which includes the management and oversight of hazardous materials. IDEM develops and enforces regulations to protect public health and the environment from the dangers posed by hazardous substances. The agency coordinates various programs to monitor and address hazardous waste management, air and water quality, and toxic substances.

While the Federal Environmental Protection Agency (EPA) sets national standards and regulatory frameworks that state agencies must adhere to, it is IDEM that implements these regulations at the state level, enforcing compliance within Indiana's jurisdiction. The Indiana Department of Transportation focuses on transportation infrastructure and safety but does not directly regulate hazardous materials. Similarly, the Indiana Health Department’s focus is more aligned with health outcomes rather than environmental management of hazardous materials. Thus, IDEM stands out as the correct answer, emphasizing its crucial role in environmental regulation pertaining to hazardous materials in Indiana.