San Lorenzo Huehuetitlan Wastewater Treatment Plant - Tianguistenco, Estado de Mexico

The San Lorenzo Huehuetitlan wastewater treatment plant is located in the municipality of Tianguistenco, Estado de Mexico, Mexico. It serves a population of 2,191 residents, classifying it as a small-scale municipal facility. The plant is situated in the central highlands of Mexico, an area with a temperate climate and significant urban development near the Toluca Valley. The plant provides secondary treatment, which is the standard level required by Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge into water bodies. With a designed capacity of 432 m³/day and an actual discharge volume of 207.36 m³/day, the plant operates at approximately 48% of its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local waterways that eventually drain into the Lerma River basin, a critical water source for the region. The Lerma River flows westward into Lake Chapala, Mexico's largest freshwater lake, which supports diverse aquatic life and provides water for agriculture and human consumption. Proper treatment at this plant helps protect downstream ecosystems and water quality in the Lerma-Chapala basin.

The plant discharges into the Lerma River basin, which flows into Lake Chapala, the largest freshwater lake in Mexico. This watershed supports a variety of aquatic species and provides irrigation and drinking water for millions of people. The region is ecologically sensitive due to water extraction and pollution pressures, making secondary treatment essential for maintaining water quality and biodiversity in the downstream lake ecosystem.