ETE LESTE Wastewater Treatment Plant, Mogi das Cruzes, São Paulo

ETE LESTE is a wastewater treatment plant located in Mogi das Cruzes, within the state of São Paulo, Brazil. The facility serves a population of around 79,622 residents, placing it in the medium agglomeration category. It operates as part of the municipal wastewater system for the region, contributing to public health and environmental protection. As a plant serving a medium-sized population in Brazil, ETE LESTE is subject to national environmental standards set by the Conselho Nacional do Meio Ambiente (CONAMA) and state-level regulations from CETESB (Companhia Ambiental do Estado de São Paulo). These frameworks typically require secondary treatment for urban wastewater, with additional nutrient removal in sensitive watersheds. The plant's designed capacity is 1.00 (likely in cubic meters per second or similar unit), indicating its scale. The treated effluent from ETE LESTE is discharged into local water bodies that eventually drain into the Tietê River basin, a major river system flowing through São Paulo state. The Tietê River ultimately reaches the Paraná River basin, which is ecologically significant for its biodiversity and supports numerous aquatic species. Proper treatment at ETE LESTE helps reduce pollution loads in this important watershed.

The plant discharges into the Tietê River basin, which flows through the metropolitan region of São Paulo and eventually joins the Paraná River. This watershed is ecologically sensitive, supporting diverse aquatic life and providing water for millions of people. Downstream, the Paraná River feeds into the Río de la Plata estuary, a critical habitat for migratory fish and bird species. Effective wastewater treatment at ETE LESTE is essential to minimize nutrient and pathogen inputs into this interconnected river system.