ETE Bonsucesso Guarulhos - Wastewater Treatment Plant in Guarulhos, São Paulo, Brazil

ETE Bonsucesso Guarulhos is a wastewater treatment plant located in Guarulhos, within the São Paulo metropolitan area, one of Brazil's most populous regions. The plant serves an estimated 115,438 residents, placing it in the medium-to-large agglomeration category for Brazilian sanitation infrastructure. As a plant of this scale in Brazil, it is subject to CONAMA Resolution 430/2011 and state-level environmental standards, which mandate secondary treatment or equivalent for discharges into water bodies. The plant's treatment process and capacity details are not publicly available, but typical facilities in this region employ activated sludge or similar biological processes to meet effluent quality standards. The treated effluent is discharged into local watercourses that drain into the Tietê River basin, a major tributary of the Paraná River system. The Tietê River flows through São Paulo state and ultimately reaches the Paraná River, which empties into the Río de la Plata estuary. This watershed supports diverse aquatic life and provides water for millions of people, making effective treatment critical for downstream ecological health.

The plant's discharge enters the Tietê River basin, which flows through the densely populated São Paulo region before joining the Paraná River. The Paraná River system is a vital freshwater resource for South America, supporting extensive biodiversity and agricultural activity. Downstream, the waters reach the Río de la Plata estuary, a ecologically sensitive area that serves as a nursery for fish and migratory birds. Effective wastewater treatment at ETE Bonsucesso Guarulhos helps reduce nutrient and pathogen loads, protecting these downstream ecosystems.