Which agency oversees UST regulations in Washington State?

The agency that oversees UST regulations in Washington State is the Washington State Department of Ecology. This department is responsible for implementing and enforcing state environmental laws, which include regulations related to underground storage tanks. Their duties involve ensuring compliance with both state and federal regulations, monitoring tank systems to prevent leaks and spills, and promoting safety and environmental protection in relation to hazardous substances stored in those tanks. The Department of Ecology provides guidance, support, and regulations that facilities must follow to maintain safe and compliant operations concerning USTs. This focus on environmental protection and public health makes the Department of Ecology the key regulatory agency concerning underground storage tanks in Washington State.