San Marcos Arteaga Wastewater Treatment Plant, Oaxaca, Mexico

San Marcos Arteaga is a wastewater treatment plant located in the town of San Marcos Arteaga, Oaxaca, Mexico. The facility serves a population of 894 and operates with secondary treatment, which is appropriate for a small community. The plant has a designed capacity of 259.20 cubic meters per day and discharges a similar volume of treated effluent. As a Mexican wastewater facility, it operates under the national regulatory framework established by the Ley de Aguas Nacionales and the Normas Oficiales Mexicanas (NOMs), which set discharge standards for municipal wastewater. For small communities like this, secondary treatment is typically sufficient to meet environmental requirements, reducing organic matter and suspended solids before discharge. The treated effluent is released into the local environment, likely into a nearby arroyo or river that drains into the Pacific Ocean via the Rio Verde or a similar coastal basin. The region of Oaxaca is ecologically diverse, and proper wastewater treatment helps protect downstream aquatic habitats and water quality for communities and ecosystems.

The plant discharges into a local watercourse that ultimately flows toward the Pacific Ocean, likely through the Rio Verde basin or a similar coastal drainage. The surrounding region in Oaxaca supports diverse ecosystems, including dry tropical forests and riparian habitats. Proper treatment is essential to prevent nutrient pollution and protect downstream aquatic life, especially in a region where water resources are vital for both human use and biodiversity.