The Songdo Wastewater Reuse Plant is a critical infrastructure project located in the Songdo International Business District, Incheon, South Korea. Built as part of a new "ubiquitous city" on reclaimed land along Incheon's waterfront, the plant serves as a national demonstration project for wastewater reuse and efficient water utilization. The plant was completed in May 2015 and has been supplying reclaimed water since its commissioning.

The facility includes a treatment plant with a capacity of 5.28 MGD, a 15 kilometer pipeline, and a booster pumping station. The project contributes to pollution reduction in the Incheon coastal area and has helped the city of Incheon be selected as one of the 12 "Water Champion" cities by the World Water Council.

The treatment process involves **chemical coagulation/flocculation, bio-filtration, ozone oxidation, and disinfection, leading to significant reductions in pollutants. The plant ensures high-quality effluent by reducing levels of BOD, SS, T-N, and T-P, thereby supporting a sustainable supply of reclaimed water for urban reuse.