Cerro Blanco Wastewater Treatment Plant, Calvillo, Aguascalientes

Cerro Blanco is a municipal wastewater treatment plant located in Calvillo, Aguascalientes, Mexico. It serves a small community of 319 people, reflecting its role in rural wastewater management within the state of Aguascalientes. The plant provides secondary treatment, which is the standard biological treatment required under Mexico's Federal Water Rights Law (Ley de Aguas Nacionales) for small-scale facilities. With a designed capacity of 86.40 cubic meters per day and a current discharge volume of 30.24 cubic meters per day, the plant operates below its capacity, indicating room for future growth. The treated effluent is discharged into local water bodies that ultimately drain into the Rio Grande de Santiago basin, flowing towards the Pacific Ocean. This watershed supports agricultural activities and diverse aquatic ecosystems, making proper treatment essential for protecting downstream water quality and public health.

The plant discharges into the Rio Grande de Santiago basin, which flows through central Mexico and eventually reaches the Pacific Ocean. This watershed supports irrigated agriculture and provides habitat for native fish species. Secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality in a region where water resources are critical for both human use and ecological health.