ETE GUARACAI Wastewater Treatment Plant, Guaraçai, São Paulo, Brazil

ETE GUARACAI is a municipal wastewater treatment plant located in Guaraçai, a city in the state of São Paulo, Brazil. The plant serves a population of about 1,996 people, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. Under Brazil's national environmental regulations (CONAMA resolutions and the National Water Resources Policy), secondary treatment is typically required for municipal wastewater to protect receiving water bodies. The plant's discharge volume is 307.10 cubic meters per day, indicating consistent operation. The treated effluent is discharged into local watercourses that drain into the Paraná River basin, one of South America's major river systems. The region's aquatic ecosystems benefit from the plant's pollution reduction, supporting biodiversity in the Paraná watershed. The plant's inland location, more than 10 km from the coast, reduces direct marine impact.

The plant discharges into small streams that flow into the Tietê River, a major tributary of the Paraná River basin. The Paraná River ultimately drains into the Río de la Plata estuary. The watershed supports diverse aquatic life, including migratory fish species, and is ecologically sensitive to nutrient loading from untreated sewage. Secondary treatment helps mitigate eutrophication risks in downstream water bodies.