La Labor Wastewater Treatment Plant, Santa María del Oro, Nayarit

La Labor wastewater treatment plant is located in the community of La Labor, within the municipality of Santa María del Oro, Nayarit, Mexico. The plant serves a population of 2,282 and operates with a designed capacity of 371.52 m³/day, currently discharging 216 m³/day of treated wastewater. The plant provides secondary treatment, which is the standard level required for municipal wastewater under Mexican regulations (NOM-001-SEMARNAT-1996). This level of treatment typically involves biological processes to reduce organic matter and suspended solids, ensuring the effluent meets discharge standards for protection of water bodies. The treated effluent from La Labor is discharged into the local watershed, which ultimately drains into the Pacific Ocean via the Río Grande de Santiago and the Marismas Nacionales system. This coastal wetland complex is ecologically significant, supporting diverse aquatic life and migratory birds. The plant's operation helps protect downstream water quality in this sensitive environment.

The plant discharges into the Río Grande de Santiago basin, which flows through Nayarit and empties into the Pacific Ocean via the Marismas Nacionales, a large coastal lagoon and mangrove system. This watershed supports diverse aquatic habitats and is important for regional biodiversity. The secondary treatment provided by La Labor helps reduce nutrient and organic loads, mitigating eutrophication risks in downstream waters.