Lagunas de Oxidacion Wastewater Treatment Plant, Estación Coyotes, Durango

Lagunas de Oxidacion is a municipal wastewater treatment plant located in Estación Coyotes, within the municipality of Pueblo Nuevo, Durango, Mexico. The facility serves a small population of 758 residents, reflecting its role in a rural or semi-urban community. The plant provides secondary treatment, a standard level for small agglomerations under Mexican water quality regulations (NOM-001-SEMARNAT). With a designed capacity of 763.78 m³/day and an actual discharge volume of 476.93 m³/day, it operates below full capacity, indicating room for future growth or seasonal flow variations. The treated effluent is discharged into local watercourses that drain into the Pacific slope of the Sierra Madre Occidental. The plant's operation helps protect downstream ecosystems, including rivers that support diverse aquatic life and provide water for agriculture and domestic use in the region.

The plant is located inland in the Sierra Madre Occidental, over 50 km from the coast. Its treated effluent flows into local streams that eventually join the Presidio River or similar Pacific-draining basins. These waterways support freshwater biodiversity and are important for local communities. The secondary treatment reduces organic load and suspended solids, mitigating eutrophication risks in downstream reservoirs and coastal lagoons.