Water / Wastewater

Increased Capacity for Growing Population

One of the fast-growing counties in Ohio needed an answer to the rising need for wastewater treatment


In 2004, Delaware County, Ohio was the fastest growing county in Ohio and the 11th fastest growing county in the nation. That same year, the City of Delaware voted to expand/upgrade the Upper Olentangy Water Reclamation Center originally constructed in 1926. Upgrades in 1974 and 1985 had increased capacity to 5.5 million gallons per day (MGD), but it was becoming increasingly difficult to meet growing demands while continuing to ensure the safe discharge of effluent into the Olentangy River, a scenic Ohio waterway. Convinced that a Design-Build delivery system would produce a superior project at a lower cost, the City changed their Charter to include Design-Build as another type of competitive bidding. The expansion/upgrade was completed on schedule.


This project protects public health through the discharge of higher quality effluent into the Olentangy River which is classified as an “Exceptional Warm Water Habitat” and a “State Scenic River”. Kokosing provided the operational flexibility to accommodate a Peak Flow Rate of 30 MGD while eliminating the environmental impact of sewer overflows. Through the Design-Build approach, the City has a state-of-the-art wastewater treatment facility designed for operational efficiency and flexibility.

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