San Luis Wastewater Treatment Plant, Ejido Zaragoza, Chihuahua, Mexico

San Luis is a wastewater treatment plant located in Ejido Zaragoza, within the municipality of Jiménez, Chihuahua, Mexico. The plant serves a small community of 183 people, reflecting its role in rural sanitation infrastructure. It operates under Mexico's national water regulations, which set standards for wastewater treatment and discharge. The plant employs secondary treatment, a biological process that removes organic matter and suspended solids. With a designed capacity of 43.20 units and a current discharge volume of 17.28 units, the facility operates below its capacity, indicating room for future growth. As a small-scale plant, it is subject to Mexican official standards (NOM-001-SEMARNAT) that govern pollutant limits for discharges into national waters. The treated effluent is likely discharged into a local watercourse or arroyo, eventually contributing to the endorheic basins of northern Mexico. The region's arid climate makes water reuse and conservation critical. The plant helps protect local groundwater and surface water from untreated sewage, supporting public health and the fragile desert ecosystem.

The plant discharges into a local watercourse within the endorheic basin of northern Chihuahua, where water does not flow to the sea but evaporates or infiltrates. This arid region relies on limited surface and groundwater resources, making treatment essential to prevent contamination. The effluent supports local irrigation or recharge, sustaining agricultural activities and wildlife in a water-scarce environment.