Monona County Of--sanitary Land Fill Onawa, IA 51040 Phone : (712) 353-6300 Business Category Government Offices-County Government Offices & Public Schools Monona County Of--monona County Landfill Onawa, IA 51040 Phone : (712) 353-6300 Business Category Government Offices-County Government Offices & Public Schools Sanitary Landfill 31342 Highway 37 Turin, IA 51040 Phone : (712) 353-6300 Business Category Environmental Conservation & Ecological Services