International Boundary Wastewater Treatment Plant
The International Wastewater Treatment Plant (IWTP) is a sewage treatment plant developed by the International Boundary and Water Commission (IBWC) in the South Bay area of San Diego, California. Construction began on a 75-acre site (30 ha), west of San Ysidro in the Tijuana River Valley.
Source: Wikipedia — International Boundary Wastewater Treatment Plant (CC BY-SA 4.0)