ETE MAUA Wastewater Treatment Plant, Mauá, São Paulo, Brazil

ETE MAUA is a wastewater treatment plant located in Mauá, within the São Paulo metropolitan region of Brazil. The facility serves a population of approximately 382,530, placing it in the large agglomeration category for regulatory purposes. As a major treatment plant in one of Brazil's most populous states, ETE MAUA is subject to CONAMA Resolution 430/2011 and state-level environmental standards. These regulations mandate appropriate treatment levels to protect water quality, with large urban plants typically required to achieve secondary or advanced treatment before discharge. The plant's treated effluent is discharged into local water bodies that drain into the Tietê River basin, a critical waterway flowing through São Paulo state. The Tietê River ultimately reaches the Paraná River system, which supports extensive aquatic ecosystems and provides water for millions of people downstream.

The plant discharges into the Tietê River basin, which flows through the heavily urbanized São Paulo region before joining the Paraná River. The Tietê River is ecologically significant, supporting diverse aquatic life and serving as a major water source. Downstream, the Paraná River basin hosts important wetlands and floodplains that provide habitat for migratory fish and bird species.