ETE CAIUA Wastewater Treatment Plant, Caiuá, São Paulo, Brazil

ETE CAIUA is a municipal wastewater treatment plant located in Caiuá, in the state of São Paulo, Brazil. The facility serves a small population of around 1,971 people, reflecting its role in a rural or small-town setting within the Presidente Prudente region. As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant operates under Brazil's national environmental regulations, which set effluent standards for wastewater treatment. For small agglomerations like Caiuá, secondary treatment is the typical requirement to protect water quality. The plant's discharge volume of 299.63 cubic meters per day indicates a modest flow consistent with the population served. The treated effluent is discharged into local water bodies 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 drinking water downstream. Proper treatment at ETE CAIUA helps maintain the ecological health of these waters.

The plant's discharge enters 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 wetlands. The Paraná River is a major water source for the region, and maintaining water quality through effective wastewater treatment is crucial for downstream communities and ecosystems.