Obispo Wastewater Treatment Plant, Culiacán, Sinaloa, Mexico

Obispo wastewater treatment plant is located in Obispo, a locality within Culiacán municipality, Sinaloa, Mexico. The plant serves a population of 1,126 and provides secondary treatment, a standard level for municipal wastewater in Mexico. The plant has a designed capacity of 146.88 m³/day and currently discharges 129.60 m³/day. As a small-scale facility, it operates under Mexico's national water laws (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996 standards, which set maximum pollutant limits for wastewater discharges into receiving waters. The treated effluent likely drains into local waterways that flow toward the Pacific Ocean via the Culiacán River basin. The region's semi-arid climate and agricultural activity make proper wastewater treatment important for protecting downstream water quality and ecosystems.

The plant discharges into the Culiacán River basin, which flows westward through Sinaloa and empties into the Pacific Ocean near the city of Culiacán. The river supports diverse aquatic life and is used for irrigation, making nutrient removal from wastewater critical to prevent eutrophication in coastal waters.