Nagaoka International Corp. engages in the operation of water treatment facilities. It operates through the following segments: Energy, Water Intake and Others. The Energy segment manufactures and sells petroleum refining and internal equipment called ""Screen Internal"" for petrochemical plants. The Water Intake segment manufactures and sells screen for water intakes. The Others segment produces and markets water treatment and environmental equipment. The company was founded by Masuzo Nagaoka on October 10, 1934 and is headquartered in Izumiotsu, Japan.