Santiago Chazumba Wastewater Treatment Plant, Oaxaca, Mexico

Santiago Chazumba wastewater treatment plant is located in the town of Santiago Chazumba, in the state of Oaxaca, Mexico. The plant serves a population of 2,738 and operates with secondary treatment, a standard level for small communities in Mexico. It has a designed capacity of 336.96 m³/day and currently discharges 259.20 m³/day of treated wastewater. The plant's secondary treatment process ensures that organic pollutants are substantially reduced before discharge. In Mexico, wastewater treatment plants are regulated under the National Water Law (Ley de Aguas Nacionales) and NOM-001-SEMARNAT-1996, which sets maximum permissible limits for pollutants in treated wastewater. For small agglomerations like Santiago Chazumba, secondary treatment is typically sufficient to meet these standards. The treated effluent is discharged into local water bodies that eventually drain into the Papaloapan River basin, which flows into the Gulf of Mexico. The plant plays a crucial role in protecting downstream water quality and aquatic ecosystems in the region.

The plant discharges into local streams that are part of the Papaloapan River basin, one of Mexico's major river systems. The Papaloapan River flows through Oaxaca and Veracruz before emptying into the Gulf of Mexico. This watershed supports diverse aquatic life and provides water for agriculture and communities downstream. Proper treatment at Santiago Chazumba helps prevent nutrient pollution and protects the ecological health of the basin.