Zacualpan II Wastewater Treatment Plant, Colima, Mexico

Zacualpan II is a municipal wastewater treatment plant located in the town of Zacualpan, within the municipality of Comala, Colima, Mexico. The plant serves a small population of 548 residents, reflecting its role in a rural or semi-urban community. It operates under Mexico's national water regulations, which mandate treatment standards for discharges into the environment. The plant provides secondary treatment, a standard level that typically involves biological processes to reduce organic matter and suspended solids. Its designed capacity is 259.20 units, with a reported discharge volume of 51.84 units, indicating it operates below full capacity. As a small-scale facility, it is subject to oversight by Mexican water authorities, likely through the National Water Commission (CONAGUA), which enforces discharge standards under the Federal Water Rights Law. The treated effluent is discharged into local water bodies, ultimately contributing to the Pacific slope drainage basin. The region's hydrology supports agricultural and ecological systems, and the plant's secondary treatment helps protect downstream water quality. Colima's coastal and volcanic terrain influences local water resources, making proper wastewater management essential for community and environmental health.

Zacualpan II discharges treated wastewater into local streams that flow toward the Pacific Ocean, likely via the Armeria River basin. This region supports diverse aquatic life and agricultural activities, and secondary treatment reduces organic pollution to help maintain water quality in downstream ecosystems. The plant's location inland, over 10 km from the coast, reduces direct marine impact, but its effluent still influences freshwater habitats and ultimately the coastal zone.