Col Esquipula Wastewater Treatment Plant, Ciudad Altamirano, Guerrero

Col Esquipula is a wastewater treatment plant located in Ciudad Altamirano, in the municipality of Pungarabato, Guerrero, Mexico. It serves a population of approximately 7,302 residents, classifying it as a small to medium agglomeration under Mexican water management frameworks. The plant is situated inland, away from coastal zones, and its operations are part of the local municipal infrastructure. The plant provides secondary treatment, which is the standard biological treatment level required for municipal wastewater in Mexico under NOM-001-SEMARNAT-1996 and subsequent updates. With a designed capacity of 1,036.80 m³/day and an actual discharge volume of 691.20 m³/day, the facility operates below its design capacity, indicating room for future growth or variable inflow. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent from Col Esquipula is discharged into the local hydrological system, ultimately contributing to the Balsas River basin, one of Mexico's major river systems. The Balsas River flows southwest through Guerrero and Michoacán before emptying into the Pacific Ocean. The plant's discharge supports the ecological health of the river by reducing pollutant loads, though secondary treatment may not fully remove nutrients, which can affect downstream aquatic ecosystems.

Col Esquipula discharges into the Balsas River basin, which drains into the Pacific Ocean. The Balsas River supports diverse aquatic life and is an important water resource for agriculture and communities in the region. The plant's secondary treatment helps mitigate organic pollution, but nutrient removal is limited, which can contribute to eutrophication in downstream water bodies. The watershed is ecologically sensitive, hosting species such as the Balsas catfish and various migratory birds.