The department's Missouri Geological Survey is responsible in part for activities associated with the exploration, production and subsurface storage of oil and gas in Missouri. Some of these responsibilities include reviewing, approving and maintaining applications to drill oil and gas production wells, and underground injection control wells (enhanced oil recovery, disposal and hydrocarbon storage wells). The department has records for approximately 10,400 wells. Well status includes active, under construction, inactive, pending, shut in, inactive, plugged, water well conversion, orphaned and abandoned.