San Juan Wastewater Treatment Plant, Cadereyta Jiménez, Nuevo León, Mexico

San Juan is a wastewater treatment plant located in Cadereyta Jiménez, within the state of Nuevo León, Mexico. The facility serves a small community of approximately 1,270 people, reflecting its role in local municipal wastewater management. As a secondary treatment plant, it employs biological processes to reduce organic matter and suspended solids, meeting standard national requirements for communities of this size. The plant operates under Mexico's national water regulations, which are enforced by the National Water Commission (CONAGUA). For small agglomerations like this, secondary treatment is typically sufficient to comply with discharge standards. The plant's designed capacity is 432.00 volume units, and it currently treats 172.80 volume units, indicating it operates below its full capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Gulf of Mexico via the Rio Grande (Río Bravo) basin. This river system supports diverse aquatic life and is an important water source for both Mexico and the United States. The plant's secondary treatment helps protect downstream water quality in this ecologically significant region.

The plant discharges into the Rio Grande (Río Bravo) basin, which flows into the Gulf of Mexico. This watershed supports a variety of aquatic species and is a critical water resource for agriculture and communities in the region. The Gulf of Mexico is a major marine ecosystem, home to fisheries and diverse habitats. Secondary treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in the coastal zone.