San Jeronimo Wastewater Treatment Plant, Purísima de Bustos, Guanajuato

San Jeronimo is a wastewater treatment plant located in Purísima de Bustos, within the municipality of Purísima del Rincón, Guanajuato, Mexico. The facility serves a population of approximately 28,295 people, making it a medium-sized agglomeration in the region. It plays a key role in managing municipal wastewater for this growing urban area. As a Mexican wastewater facility, San Jeronimo operates under the national regulatory framework, which includes the General Law of Ecological Balance and Environmental Protection (LGEEPA) and the Official Mexican Standards (NOMs) for wastewater discharge. For a plant serving around 28,000 people, secondary treatment is typically required to meet discharge standards. It is expected to comply with federal and state environmental regulations. The treated effluent from San Jeronimo is discharged into local water bodies that eventually drain into the Lerma River basin, one of Mexico's most important hydrological systems. The Lerma River flows into Lake Chapala, the largest lake in Mexico, and ultimately connects to the Pacific Ocean via the Santiago River. Protecting this watershed is critical for downstream communities, agriculture, and aquatic ecosystems.

The plant's discharge enters the Lerma River basin, which flows into Lake Chapala and then the Santiago River to the Pacific Ocean. This watershed supports diverse aquatic life and provides water for irrigation and drinking water for millions. The region faces challenges from agricultural runoff and industrial pollution, making effective wastewater treatment essential for maintaining water quality and ecosystem health.