Coatepec Harinas Wastewater Treatment Plant, Estado de México, Mexico

The Coatepec Harinas wastewater treatment plant is located in the municipality of Coatepec Harinas, Estado de México, Mexico. It serves a population of approximately 9,127 people, classifying it as a small agglomeration under Mexican wastewater regulations. The plant provides secondary treatment, which is the standard level required for municipal wastewater in Mexico under the official Mexican standards (NOM-001-SEMARNAT). The facility has a designed capacity of 950.4 m³/day and currently discharges 864 m³/day of treated effluent. The treated wastewater is discharged into local water bodies that ultimately drain into the Balsas River basin, one of Mexico's major river systems. The Balsas River flows southwest to the Pacific Ocean, supporting diverse aquatic ecosystems and agricultural communities along its course.

The plant discharges into the Balsas River basin, which drains into the Pacific Ocean. The Balsas River is a vital water source for agriculture and biodiversity in central Mexico, supporting species such as the endangered Pátzcuaro frog and various migratory birds. Secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality.