Luis Felipe Castellanos Diaz Wastewater Treatment Plant, Tabasco, Mexico

The Luis Felipe Castellanos Diaz wastewater treatment plant is located in the town of Capitán Felipe Castellanos Díaz (San Pedro), within the municipality of Balancán, Tabasco, Mexico. This facility serves a population of 2,435 residents, making it a small-scale municipal treatment plant in the rural region of southeastern Mexico. The plant provides secondary treatment, which is the standard level required under Mexican regulations (NOM-001-SEMARNAT-1996) for municipal wastewater before discharge into water bodies. With a designed capacity of 432 m³/day and a reported discharge volume of 432 m³/day, the plant operates at full capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local water bodies that ultimately drain into the Grijalva River basin, one of Mexico's major river systems. The Grijalva River flows northward through Tabasco and empties into the Gulf of Mexico. This region is ecologically significant, supporting diverse aquatic life and wetlands that are important for migratory birds and local fisheries.

The plant discharges into the Grijalva River basin, which flows through the low-lying, floodplain-rich region of Tabasco. The Grijalva River is a major waterway that drains into the Gulf of Mexico, supporting extensive wetlands and mangrove ecosystems near the coast. These habitats are critical for fish spawning, waterfowl, and regional biodiversity. The plant's secondary treatment helps reduce organic pollution, but the full capacity operation suggests careful monitoring is needed to maintain water quality in this ecologically sensitive watershed.