Janesville Wastewater Plant 3300 W Tripp Rd Janesville, WI 53548 Phone : (608) 755-3120 Business Category Government Offices-City Village & Twp Legislative Bodies Janesville City Of--wastewater Treatment Plant Janesville, WI 53545 Phone : (608) 755-3120 Business Category Government Offices-City Village & Twp Environmental Conservation & Ecological Services Government Offices State & Local Environmental Services Government Offices & Public Schools