Mesillas Wastewater Treatment Plant, Tepezalá, Aguascalientes, Mexico

Mesillas is a wastewater treatment plant located in Tepezalá, Aguascalientes, Mexico, serving a small community of 1,278 people. The plant provides secondary treatment, a standard level for municipal wastewater in Mexico, ensuring that pollutants are reduced before discharge. The plant has a designed capacity of 216.00 cubic meters per day and currently treats an average of 120.96 cubic meters daily, indicating operational headroom. As a Mexican facility, it operates under national water quality standards (NOM-001-SEMARNAT) which set discharge limits for conventional pollutants. The treated effluent is discharged into local water bodies that ultimately drain into the Rio Grande de Santiago basin, flowing towards the Pacific Ocean. The plant plays a key role in protecting local water resources in the semi-arid Aguascalientes region, where water reuse and conservation are critical.

The plant discharges into the Rio Grande de Santiago basin, which flows through central Mexico and eventually reaches the Pacific Ocean. This watershed supports agricultural irrigation and provides habitat for native aquatic species. In the semi-arid climate of Aguascalientes, treated wastewater is a valuable resource for maintaining base flows in local streams.