Francisco Primo Verdad Wastewater Treatment Plant, Durango, Mexico

Francisco Primo Verdad is a wastewater treatment plant located in the community of Francisco Primo de Verdad, within the municipality of San Juan del Río, Durango, Mexico. The plant serves a population of 639 and operates under Mexico's national water quality regulations. The plant provides secondary treatment, which is appropriate for its small population size. With a designed capacity of 259.20 m³/day and an actual discharge volume of 60.48 m³/day, the facility operates well below its capacity. Mexican wastewater treatment plants are regulated by the National Water Commission (CONAGUA), which sets discharge standards under NOM-001-SEMARNAT-1996. The treated effluent is discharged into local water bodies that ultimately drain into the Nazas River basin, part of the endorheic Bolsón de Mapimí region. This area supports semi-arid ecosystems and agricultural activities downstream.

The plant's discharge contributes to the Nazas River basin, which flows into the endorheic Bolsón de Mapimí, a closed basin with no outlet to the sea. This region supports desert and semi-arid ecosystems, including endemic species. Proper treatment is critical to prevent nutrient loading and maintain water quality for downstream agricultural and ecological uses.