What service provides information and advice on hazardous waste spills 24 hours a day?

The Chemical Emergency Center (CHEMTREC) is the correct choice because it operates 24 hours a day, providing critical information and advice regarding hazardous materials incidents, including spills. This service is specifically designed to assist not only emergency responders in managing chemical emergencies but also businesses and public safety officials. CHEMTREC offers accessible, reliable information about hazardous substances, ensuring that those affected by a hazardous waste spill can obtain immediate assistance and guidance.

Other options, while relevant to environmental health and hazardous waste, do not provide the same direct, round-the-clock service for hazardous waste spills as CHEMTREC does. For example, the RCRA/Superfund hotline may be related to broader regulatory concerns but does not serve the same immediate emergency response purpose as CHEMTREC. The role of the EPA administrator is more administrative and regulatory and does not involve direct emergency response services.