Cienega de Nuestra Senora de Guadalupe Wastewater Treatment Plant, Durango, Mexico

Cienega de Nuestra Senora de Guadalupe is a wastewater treatment plant located in Cienega de Nuestra Senora, within the municipality of Santiago Papasquiaro, Durango, Mexico. The plant serves a small community of 1,643 residents, reflecting its role in rural wastewater management in the region. The plant provides secondary treatment, which is a standard biological process that removes organic matter and suspended solids. With a daily discharge volume of 155.52 cubic meters and a designed capacity of 259.20 cubic meters, it operates below its full capacity. As a Mexican facility, it falls under national water quality regulations administered by CONAGUA, which mandate treatment standards for municipal wastewater. The treated effluent is discharged into local waterways that ultimately drain into the Pacific Ocean via the Rio San Pedro Mezquital basin. The plant's location over 50 km from the coast reduces direct marine impact, but its discharge supports the health of inland aquatic ecosystems in the Sierra Madre Occidental region.

The plant discharges into the Rio San Pedro Mezquital watershed, which flows through Durango and Nayarit before reaching the Pacific Ocean. This basin supports diverse freshwater habitats and is important for local agriculture and biodiversity. The secondary treatment helps protect downstream water quality in a region characterized by mountainous terrain and seasonal rainfall.