Ecology’s Toxics Cleanup Program (TCP) works to clean up contaminated properties throughout Washington state. Cleanup projects vary greatly in size and complexity. Some are small and routine, like cleaning up contamination from a leaking underground storage tank. Many cleanups are large, complex projects that require engineered solutions. In addition, TCP regulates more than 8,900 underground storage tanks at more than 3,400 facilities (both private businesses and public entities). We work to ensure that these tanks are installed, managed, and monitored in a manner that prevents releases into the environment.