This document summarizes updates to Oregon's DEQ Heating Oil Tank Program. It was developed in 2000 to set standards for soil sampling, tank decommissioning, and cleanups to protect human health and the environment from groundwater and indoor air contamination. New regulations have been adopted where ethylbenzene and naphthalene levels driving cleanup activities must be below 0.82 ppm and 6.5 ppm respectively. This means that many residential heating oil tank sites will now require additional evaluation like air sampling or excavation, making the cleanup process more expensive, impactful to property, and time-consuming.