El Siete Volado Wastewater Treatment Plant, El Siete, Durango, Mexico

El Siete Volado is a wastewater treatment plant located in El Siete, a locality in the municipality of Gómez Palacio, Durango, Mexico. The plant serves a small population of approximately 913 residents, reflecting its role in a rural or peri-urban setting within the arid northern region of Mexico. The plant operates with secondary treatment, which is the standard level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge into water bodies. With a designed capacity of 432.00 cubic meters per day and an actual discharge volume of 86.40, the plant is operating well below its capacity, indicating potential for future growth or seasonal variations. The treated effluent is discharged into the local environment, likely contributing to the Nazas River basin or an arroyo system that drains into the Laguna District. This region is part of the endorheic basin of the Bolsón de Mapimí, where water resources are scarce and treated wastewater reuse is critical for sustaining local ecosystems and agricultural activities.

The plant discharges into the arid watershed of the Nazas River basin, which flows through the Comarca Lagunera region before terminating in the Laguna de Mayrán, a dry lakebed in the Bolsón de Mapimí. This endorheic basin supports fragile desert ecosystems and limited agricultural irrigation. The treated effluent helps maintain base flows in intermittent streams and provides a water source for local wildlife, though the region faces challenges from water scarcity and potential contamination from agricultural runoff.