Mil Diez Wastewater Treatment Plant, El Mil Diez, Durango, Mexico

Mil Diez is a municipal wastewater treatment plant located in El Mil Diez, a locality in the municipality of Pueblo Nuevo, Durango, Mexico. The plant serves a population of approximately 1,460 residents, classifying it as a small-scale facility within the state's wastewater infrastructure. The plant operates with secondary treatment, which is the standard level required under Mexican regulations (NOM-001-SEMARNAT-1996) for discharges to national waters. It has a designed capacity of 235.87 m³/day and currently treats 138.24 m³/day, indicating operational headroom. The facility is situated inland, more than 50 km from the coast. Treated effluent from the plant is discharged into local water bodies that ultimately drain into the Pacific Ocean via the Presa El Palmito and the Río Presidio system. The plant plays a key role in protecting downstream water quality in a region characterized by mountainous terrain and forested watersheds.

The plant discharges into the Presa El Palmito reservoir, which feeds into the Río Presidio and eventually reaches the Pacific Ocean near Mazatlán. The watershed supports diverse aquatic life and is important for local agriculture and fisheries. Protecting water quality in this basin helps maintain ecological balance in a region with seasonal rainfall and sensitive forest ecosystems.