ETE VACARIU Wastewater Treatment Plant, Araçoiaba da Serra, São Paulo

ETE VACARIU is a wastewater treatment plant located in Araçoiaba da Serra, within the state of São Paulo, Brazil. The facility serves a population equivalent of 4,691, classifying it as a small-scale treatment plant in the region. It is situated in the interior of São Paulo state, away from the coast, and plays a role in managing local domestic wastewater. As a small agglomeration, the plant is subject to Brazil's environmental regulations, which require adequate treatment to protect water quality. Plants of this scale typically employ secondary treatment or equivalent technologies to meet discharge standards. The regulatory framework in Brazil, overseen by agencies such as CETESB in São Paulo, sets effluent limits based on the receiving water body's sensitivity. The plant's treated effluent is discharged into local watercourses that ultimately drain into the Paraná River basin, one of South America's major river systems. This basin supports diverse aquatic ecosystems and provides water for agriculture, industry, and human consumption downstream. Proper treatment at ETE VACARIU helps protect these water resources from nutrient pollution and pathogens.

The plant discharges into local streams that are part of the Paraná River basin, which flows through southeastern Brazil and into the Río de la Plata estuary. This basin is ecologically significant, supporting diverse fish species and providing critical water resources for the region. The surrounding area is characterized by Atlantic Forest remnants and agricultural land, making nutrient control important to prevent eutrophication in downstream water bodies.