West-Mark Tanks manufactures D.O.T code tanks, vacuum tanks and specialty equipment for the global transportation tank trailer industry. The company was founded in Modesto, Calif., in 1967 to fill a need for the manufacturing and repair of tank transportation equipment for the dairy industry. It has current headquarters in Ceres, Calif., and operates a tanker manufacturing plant in Atwater, Calif.; repair facilities in Ceres and Bakersfield, Calif.; and a fire apparatus division in Ceres.