Santa Martha Acatitla Wastewater Treatment Plant, Iztapalapa, Ciudad de México

Santa Martha Acatitla is a wastewater treatment plant located in the Iztapalapa borough of Ciudad de México, Mexico. It serves a population of 8,434, classifying it as a small to medium agglomeration within the metropolitan area. The plant provides secondary treatment, which is the standard level for municipal wastewater in Mexico under the national water law (Ley de Aguas Nacionales). The plant has a designed capacity of 1,209.60 volume units and a reported discharge volume of 798.34 volume units, indicating it operates below its maximum capacity. As a secondary treatment facility, it employs biological processes to reduce organic matter and suspended solids before discharge. The plant is part of Mexico's broader wastewater infrastructure managed by the National Water Commission (CONAGUA) and local water authorities. The treated effluent from Santa Martha Acatitla is discharged into the local drainage system, which ultimately flows into the Valley of Mexico basin. This basin is a closed hydrological system, meaning water does not naturally drain to the sea. The region faces significant water quality challenges due to urban runoff and industrial discharges, making treatment plants like this critical for protecting local water bodies and public health.

The plant discharges into the Valley of Mexico basin, a closed basin that historically contained lakes such as Lake Texcoco. Today, the basin's water is managed through a complex system of canals and tunnels to prevent flooding and convey wastewater. The downstream environment includes urban waterways and agricultural areas that rely on treated water for irrigation. Protecting water quality in this basin is essential for the health of the local ecosystem and the millions of residents in the Mexico City metropolitan area.