ETE Indiaporã Bacia 1 - Secondary Wastewater Treatment Plant in Indiaporã, São Paulo, Brazil

ETE Indiaporã Bacia 1 is a municipal wastewater treatment plant located in Indiaporã, in the state of São Paulo, Brazil. The plant serves a population of approximately 1,075 people, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard biological treatment process that removes organic matter and suspended solids. Brazilian regulations under CONAMA Resolution 430/2011 and state-level standards require adequate treatment for discharge into water bodies. For small agglomerations, secondary treatment is typically sufficient to meet environmental compliance. The treated effluent is discharged into local water bodies that eventually drain into the Paraná River basin, a major hydrological system in South America. The plant's proximity to the coast (within 10 km) means its discharge can influence coastal water quality, though the volume is relatively small. Proper operation helps protect downstream ecosystems and supports public health in the region.

The plant discharges into the Paraná River basin, which flows into the Río de la Plata estuary and ultimately the Atlantic Ocean. The local watershed supports diverse aquatic life and is important for regional water supply. The plant's coastal proximity means that even small discharges can affect nearshore water quality, making effective treatment essential for preserving ecological balance.