Mezquitillo Chapeteado II Wastewater Treatment Plant, Sinaloa, Mexico

Mezquitillo Chapeteado II is a wastewater treatment facility located in Ejido Mezquitillo (Chapeteado), within the municipality of Culiacán, Sinaloa, Mexico. The plant serves a population of 1,127 and operates with a designed capacity of 120.96 m³/day, treating an average discharge volume of 112.32 m³/day. The plant provides secondary treatment, which is the standard level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge. For small communities like this, secondary treatment effectively reduces organic matter and suspended solids, meeting the basic environmental standards set by the federal water authority CONAGUA. The facility is located within 10 km of the Pacific coast, meaning its treated effluent likely drains into coastal waters or nearby estuaries. This proximity to the ocean underscores the importance of proper treatment to protect marine ecosystems, including the rich biodiversity of the Gulf of California, which supports fisheries and migratory species.

The plant discharges into the Pacific coastal zone near the Gulf of California, a biologically productive sea that supports diverse marine life including shrimp, fish, and sea turtles. The local watershed drains from the Sierra Madre Occidental through the Culiacán River basin, eventually reaching the Pacific. Effective treatment is critical to prevent nutrient loading and pathogen contamination in these sensitive coastal waters.