San Juan Evangelista Wastewater Treatment Plant, Jalisco, Mexico

San Juan Evangelista is a municipal wastewater treatment plant located in the town of San Juan Evangelista, within Tlajomulco de Zúñiga municipality in the state of Jalisco, Mexico. The plant serves a population of 4,564 residents, providing secondary treatment to manage domestic wastewater from the community. The plant has a designed capacity of 864.00 cubic meters per day and currently treats an average of 432.00 cubic meters daily, operating at 50% capacity. As a secondary treatment facility, it meets the standard requirements for municipal wastewater treatment in Mexico under NOM-001-SEMARNAT-1996, which sets discharge limits for pollutants into national waters. The treated effluent is discharged into local water bodies that eventually drain into the Santiago River basin, a major hydrological system in western Mexico. The Santiago River flows into the Pacific Ocean near San Blas, Nayarit, supporting diverse aquatic ecosystems and agricultural activities along its course.

The plant discharges into the Santiago River basin, which flows through Jalisco and Nayarit before reaching the Pacific Ocean. The downstream environment includes agricultural areas and wetlands that rely on water quality. The Santiago River supports fish populations and migratory birds, making effective wastewater treatment critical to prevent nutrient loading and protect aquatic habitats.