Tzimol Wastewater Treatment Plant, Chiapas, Mexico - Secondary Treatment for 4,107 Residents

Tzimol wastewater treatment plant is located in the town of Tzimol, in the state of Chiapas, Mexico. The facility serves a population of approximately 4,107 residents, providing secondary treatment for municipal wastewater. It is an inland plant, situated away from coastal areas. The plant has a design capacity of 648.00 cubic meters per day and currently discharges 388.80 cubic meters daily, indicating a capacity utilization of about 60%. As a secondary treatment facility, it meets the standard level of treatment required for urban wastewater in Mexico under the national water law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996, which sets discharge limits for pollutants into national waters. The treated effluent is discharged into local water bodies that ultimately drain into the Grijalva River basin, one of the most important hydrological systems in southern Mexico. The Grijalva River flows through Chiapas and into the Gulf of Mexico, supporting diverse aquatic ecosystems and providing water for agriculture and communities downstream.

The plant discharges into the Grijalva River basin, which drains into the Gulf of Mexico. The Grijalva River is a major waterway in Chiapas, supporting rich biodiversity including fish, amphibians, and migratory birds. Downstream, the river flows through the Sumidero Canyon and into the coastal plains, where wetlands and estuaries provide critical habitat. The plant's secondary treatment helps reduce organic pollution and protect these downstream ecosystems.