San Isidro Wastewater Treatment Plant, Nacajuca, Tabasco, Mexico

San Isidro is a wastewater treatment plant located in Nacajuca, Tabasco, Mexico, serving a population of approximately 6,389 residents. The plant provides secondary treatment, which is the standard level for municipal wastewater in Mexico under NOM-001-SEMARNAT-1996, ensuring removal of organic matter and suspended solids before discharge. The plant has a designed capacity of 691.20 cubic meters per day and currently treats a daily flow of 604.80 cubic meters, indicating it operates below its full capacity. Located in the low-lying, humid region of Tabasco, the plant's treated effluent likely enters local waterways that drain into the Grijalva River system, ultimately reaching the Gulf of Mexico. This region is ecologically important, supporting diverse aquatic life and wetlands that provide critical habitat and flood regulation.

The plant discharges into local waterways within the Grijalva River basin, which flows through the state of Tabasco and empties into the Gulf of Mexico. This watershed supports extensive wetlands and floodplains that are ecologically sensitive, providing habitat for fish, birds, and other wildlife. The secondary treatment helps protect these downstream ecosystems from excessive nutrient loading and organic pollution.