ETE Santa Isabel Wastewater Treatment Plant, Salto, São Paulo, Brazil

ETE Santa Isabel is a municipal wastewater treatment plant located in Salto, within the state of São Paulo, Brazil. The plant serves a population of approximately 72,382 residents in the Sorocaba metropolitan region, an area characterized by urban and industrial development. As part of Brazil's wastewater infrastructure, the plant plays a key role in managing domestic sewage from the city and surrounding areas. Under Brazil's regulatory framework, wastewater treatment plants serving populations over 50,000 are typically required to provide at least secondary treatment to meet national effluent standards set by CONAMA (Conselho Nacional do Meio Ambiente). Plants of this scale in São Paulo state often employ biological treatment systems such as activated sludge or aerated lagoons to reduce organic load and pathogens before discharge. The treated effluent from ETE Santa Isabel is discharged into local water bodies that ultimately drain into the Tietê River basin, a major river system flowing through São Paulo state. The Tietê River is ecologically significant, supporting diverse aquatic life and providing water for downstream communities. Proper treatment at this plant helps protect water quality in the basin and reduces pollution impacts on the river's ecosystem.

The plant's treated effluent enters local streams that flow into the Tietê River, a major waterway in São Paulo state that drains into the Paraná River basin and eventually reaches the Río de la Plata estuary. The Tietê River supports diverse aquatic life and is an important water source for agriculture and industry downstream. Effective wastewater treatment at ETE Santa Isabel helps mitigate nutrient loading and organic pollution, preserving the ecological health of the river system.