We have assisted the City of Abilene with wastewater discharge permitting and water quality regulatory support for nearly 3 decades, preparing numerous renewal and amendment applications for the City’s Hamby Wastewater Treatment Plant discharge permit. In 2013, we worked closely with the City and wastewater design engineers to develop an amendment to the discharge permit to support an indirect potable reuse project. This project included an intensive study of reuse options and design of advanced wastewater treatment processes at the Hamby Wastewater Treatment Plant; but it also required development of a new outfall from the plant to one of the City’s major water-supply reservoirs. Our permit amendment proposed the new outfall and provided sophisticated water-quality modeling for the receiving water necessary to justify the new outfall. To finalize the permit, we negotiated permit conditions with the Texas Commission on Environmental Quality wastewater permitting team, ultimately obtaining a state-of-the-art discharge permit to allow the City to greatly enhance their water-supply outlook for the future. Today, this project provides an important supplement to the City’s water supply sources.