Santa Rosa de Lima Wastewater Treatment Plant, Oaxaca, Mexico

Santa Rosa de Lima is a wastewater treatment plant located in the town of Santa Rosa de Lima, within the municipality of Tututepec, Oaxaca, Mexico. The plant serves a population of 3,012 and is situated near the Pacific coast of southern Mexico, an area characterized by tropical climate and significant biodiversity. The plant provides secondary treatment, which is the standard biological treatment required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater. With a designed capacity of 285.12 cubic meters per day, the plant operates at full capacity based on the reported discharge volume. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids, meeting the basic effluent quality standards for discharge into water bodies. The treated effluent is discharged into local watercourses that drain into the Pacific Ocean. The coastal environment in this region includes important mangrove ecosystems and estuaries that support diverse marine life. Proper wastewater treatment is critical to protect these sensitive coastal habitats from nutrient pollution and pathogens, ensuring the health of local fisheries and tourism-dependent communities.

The plant discharges into local streams that flow into the Pacific Ocean near the coast of Oaxaca. This region features coastal lagoons and mangrove forests that serve as critical nursery habitats for fish and crustaceans, and support migratory bird populations. The discharge of treated wastewater must meet Mexican standards to prevent eutrophication and protect the ecological integrity of these coastal ecosystems.