Billings City Of--public Utilities Department (water & Wastewater Dep, Wastewater Treatment Plant Highway 87 S Billings, MT 59101 Phone : (406) 657-8356 Business Category Government Offices-City Village & Twp Underground Utilities Locating Service Environmental Conservation & Ecological Services Utilities Government Offices State & Local Environmental Services Government Offices & Public Schools Sewer Wastewater 725 Highway 87 E Billings, MT 59111 Phone : (406) 657-8356 Business Category Sewer Contractors Water-Sewer Pipeline & Comms/Power Line Sewers-wastewater Us Highway 87 E Billings, MT 59101 Phone : (406) 657-8356 Business Category Government Offices-City Village & Twp Legislative Bodies