ETE ABC Wastewater Treatment Plant, São Paulo, Brazil

ETE ABC is a wastewater treatment plant located in the Sacomã district of São Paulo, Brazil. Serving a population of around 17,851, it is part of the municipal wastewater infrastructure for the São Paulo metropolitan area, one of the largest urban agglomerations in the Southern Hemisphere. As a plant of this scale in Brazil, ETE ABC is subject to federal water quality standards established by CONAMA (National Environment Council) and state-level regulations from CETESB (São Paulo State Environmental Company). These regulations typically require secondary treatment for urban wastewater, with additional nutrient removal in sensitive watersheds. The plant's treated effluent is discharged into the local drainage network, which ultimately flows into the Tietê River basin. The Tietê River runs through São Paulo state and empties into the Paraná River system, eventually reaching the Río de la Plata estuary. Protecting this waterway is critical for downstream communities and ecosystems.

The plant discharges into the Tietê River basin, a major waterway in southeastern Brazil that flows through São Paulo state. The Tietê River is heavily urbanized and has historically suffered from pollution, making effective wastewater treatment essential for improving water quality. Downstream, the river joins the Paraná River system, which supports diverse aquatic life and provides water for millions of people. The plant's location in a densely populated area means its performance directly affects local streams and the broader watershed.