El Orito Wastewater Treatment Plant, Zacatecas, Mexico

El Orito is a wastewater treatment plant located in Zacatecas, Mexico, serving the city of Zacatecas and surrounding areas. With a designed capacity of 1.00 (units unspecified) and a population served of 100,400, it is a medium-to-large facility in the region. The plant is situated inland, more than 50 km from the coast, and its operations are subject to Mexican environmental standards. Under Mexico's regulatory framework, wastewater treatment plants of this scale are typically required to meet secondary treatment standards as per NOM-001-SEMARNAT-1996, which sets limits for pollutants in discharges to national waters. The regulatory context ensures compliance with effluent quality standards for municipal wastewater. The plant discharges into local water bodies that eventually drain into the Pacific Ocean via the Lerma-Santiago basin or internal basins in the Zacatecas region. The surrounding environment includes semi-arid landscapes and agricultural areas, where treated wastewater plays a critical role in protecting downstream water quality and supporting local ecosystems.

El Orito discharges into the local watershed, which is part of the Lerma-Santiago-Pacific hydrological region. The receiving water bodies eventually flow to the Pacific Ocean, supporting diverse aquatic life and agricultural irrigation. The semi-arid climate of Zacatecas makes water quality management crucial for maintaining ecological balance and human use.