Huizcolote II Wastewater Treatment Plant, El Huizcolote, Colima

Huizcolote II is a municipal wastewater treatment plant located in El Huizcolote, within the municipality of Manzanillo, Colima, Mexico. The plant serves a small population of 274 residents, reflecting its role in a rural or peri-urban community. As a secondary treatment facility, it provides biological treatment to reduce organic pollutants and suspended solids before discharge. In Mexico, wastewater treatment plants of this scale are regulated under the National Water Law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996, which sets maximum permissible limits for pollutants in treated wastewater. The plant's designed capacity is 86.40 megaliters per year, with an actual discharge volume of 25.92 megaliters per year, indicating operational capacity well below design. The treated effluent is discharged into local water bodies that ultimately drain into the Pacific Ocean via the coastal watershed of Colima. The region's tropical climate and proximity to the Pacific coast make proper treatment essential for protecting downstream aquatic ecosystems and coastal water quality.

The plant discharges into local streams that flow toward the Pacific Ocean, contributing to the coastal watershed of Colima. The receiving waters support diverse aquatic life and are important for local fisheries and tourism. Effective secondary treatment helps prevent nutrient enrichment and pathogen contamination in downstream coastal environments.