Estacion Coahuila Wastewater Treatment Plant, Ciudad Coahuila, Baja California

Estacion Coahuila is a municipal wastewater treatment plant located in Ciudad Coahuila, within the municipality of Mexicali in Baja California, Mexico. The plant serves a population of about 8,853 people, classifying it as a small to medium agglomeration under Mexican water management standards. The plant provides secondary treatment, which is the standard level required for urban wastewater in Mexico under the National Water Law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996, which sets pollutant discharge limits. The designed capacity is 1,728 thousand cubic meters per year, and the current discharge volume is 838.08 thousand cubic meters per year, indicating operational capacity is below design. The treated effluent is discharged into the local watershed, which ultimately drains into the Colorado River basin and the Gulf of California. This region is ecologically sensitive, supporting diverse aquatic life and agricultural activities that depend on water quality. The plant plays a key role in protecting downstream ecosystems and public health.

The plant discharges into the Colorado River basin, which flows into the Gulf of California (Sea of Cortez). This watershed is critical for agriculture and biodiversity in the arid region. The Gulf of California is a highly productive marine ecosystem supporting fisheries and migratory species. Effective wastewater treatment is essential to prevent nutrient pollution and protect these downstream environments.