La Purisima El Charco Wastewater Treatment Plant, San Luis del Cordero, Durango, Mexico

La Purisima El Charco is a wastewater treatment plant located in San Luis del Cordero, Durango, Mexico. It serves a small population of 158 people, reflecting its role in a rural or small community setting within the state of Durango. The plant provides secondary treatment, which is a standard biological treatment process that reduces organic matter and suspended solids. With a designed capacity of 51.84 volume units and a discharge volume of 43.20 volume units, the plant operates at a utilization rate that suggests it is actively managing the local wastewater load. Under Mexican regulations (NOM-001-SEMARNAT-1996), secondary treatment is typically required for discharges to water bodies, ensuring compliance with national water quality standards. The treated effluent is discharged into the local environment, likely into an arroyo or seasonal stream that drains into the larger Nazas River basin. This region is part of the endorheic basin of the Bolson de Mapimi, an arid area where water resources are scarce and sensitive. The plant's operation helps protect local groundwater and surface water from untreated sewage, supporting the ecological health of the surrounding semi-desert ecosystem.

The plant discharges into the local drainage system, which is part of the Nazas River basin, ultimately flowing into the Bolson de Mapimi, an endorheic basin in northern Mexico. This arid region has limited water resources, making the treatment plant crucial for preventing contamination of local aquifers and seasonal watercourses. The area supports desert-adapted flora and fauna, and the plant's secondary treatment helps maintain water quality for downstream uses and ecological balance.