Environmental Services Department 405 6th St # 409 Sioux City, IA 51101 Phone : (712) 279-6222 Environmental Services Department Business Category Environmental Conservation & Ecological Services Sioux City City Of--environmental Services Department, Administration Sioux City, IA 51101 Phone : (712) 279-6222 Business Category Government Offices-City Village & Twp Government Offices State & Local Government Offices & Public Schools