SD1 is responsible for the collection and treatment of Northern Kentucky's wastewater, as well as regional storm water management. SD1 is the second largest public sewer utility in Kentucky with a service area that covers approximately 220 square miles, encompassing more than 30 municipalities and unincorporated portions of Boone, Campbell and Kenton counties.

SD1 maintains more than 1,700 miles of sanitary sewer line, 142 wastewater pumping stations, 15 flood pump stations, eight package treatment plants, three major wastewater treatment plants, more than 400 miles of storm sewer and over 30,000 storm sewer structures.