This study estimates the regional economic contribution and costs of the oil production industry in the San Ardo oilfield, the tax contributions of the industry, and the environmental costs and contributions of the industry to the Monterey County economy. The study was conducted as a response to a request from the Monterey County for Energy Independence for an independent and impartial study of the past, present and future economic and environmental impact for Monterey County of the oil production industry in southern Monterey County, near San Ardo.