Caleras Wastewater Treatment Plant - Colima, Mexico

Caleras is a wastewater treatment plant located in the town of Caleras, within the municipality of Tecomán, Colima, Mexico. The facility serves a population of approximately 1,491 residents, classifying it as a small-scale municipal treatment plant. Its location in the Pacific coastal state of Colima places it within a region characterized by tropical climate and agricultural activity. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 604.80 m³/day and an average discharge volume of 488.16 m³/day, the plant operates at a utilization rate that suggests adequate capacity for its service area. Mexican wastewater treatment plants are regulated under NOM-001-SEMARNAT-1996, which sets discharge limits for pollutants into national waters. The treated effluent from Caleras ultimately drains into the Pacific Ocean via local waterways. The region's hydrology supports coastal ecosystems, including estuaries and mangrove habitats that are sensitive to nutrient loading. Proper secondary treatment helps mitigate impacts on these downstream environments.

Caleras is located in the coastal state of Colima, within the Armería River basin, which drains into the Pacific Ocean. The receiving water bodies support diverse aquatic life, including fish and crustaceans important for local fisheries. The region's tropical climate and agricultural runoff make nutrient management critical for preventing eutrophication in downstream coastal waters.