Mirandillas Wastewater Treatment Plant, San Miguel el Alto, Jalisco

Mirandillas is a wastewater treatment plant located in San Miguel el Alto, within the Jalisco state of Mexico. It serves a small community of 926 people, reflecting its role in managing local domestic wastewater in the Altos Sur region. The plant is situated inland, away from coastal areas, and operates under Mexico's national water regulations. The plant provides secondary treatment, which is the standard biological process for reducing organic matter and suspended solids. With a designed capacity of 172.80 cubic meters per day and a discharge volume matching that figure, the plant operates at full capacity. Mexico's water quality standards, enforced by CONAGUA (National Water Commission), require secondary treatment for discharges into water bodies to protect public health and the environment. The treated effluent is discharged into local watercourses that ultimately drain into the Lerma-Chapala basin, a major hydrological system feeding Lake Chapala, Mexico's largest freshwater lake. This basin supports diverse aquatic life and is critical for regional water supply and agriculture. Proper treatment at Mirandillas helps reduce nutrient loading and protect downstream ecosystems.

The plant discharges into the Lerma-Chapala basin, which flows into Lake Chapala, a vital freshwater resource for the region. The lake supports a variety of fish species and migratory birds, making it ecologically sensitive. Effective wastewater treatment is essential to prevent eutrophication and maintain water quality in this important watershed.