The Lompoc Oil Field is a large oil field in the Purisima Hills north of Lompoc, California, in Santa Barbara County. Discovered in 1903, two years after the discovery of the Orcutt Oil Field in the Solomon Hills, it is one of the oldest oil fields in northern Santa Barbara County, and one of the closest to exhaustion, reporting only of recoverable oil remaining out of its original as of the end of 2008. Its sole operator as of 2016 was Freeport McMoRan Oil and Gas, who acquired it with their 2013 purchase of Plains Exploration & Production. In 2009, the proposed decommissioning and habitat restoration of the field was part of a controversial and so-far unsuccessful deal between Plains, several environmental groups, Santa Barbara County, and the State of California, to allow Plains to carry out new offshore oil drilling on the Tranquillon Ridge, in the Pacific Ocean about southwest of the Lompoc field.