ETE Lucianópolis Wastewater Treatment Plant, Lucianópolis, São Paulo

ETE Lucianópolis is a municipal wastewater treatment plant located in Lucianópolis, within the Bauru region of São Paulo state, Brazil. The facility serves a small population of 1,756 residents, reflecting its role in a rural or small-town setting. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. In Brazil, wastewater treatment plants are regulated under national environmental standards (CONAMA resolutions) and state-level agencies such as CETESB in São Paulo. For small agglomerations like this, secondary treatment is typically sufficient to meet discharge quality requirements. The treated effluent is discharged into a local watercourse that flows within the Paraná River basin, one of South America's major river systems. The downstream environment includes tributaries that eventually reach the Paraná River, supporting diverse aquatic life and agricultural water use. Proper treatment helps protect these water resources from nutrient pollution and pathogens.

The plant discharges into a small stream within the Paraná River basin, which drains into the Paraná River and ultimately the Río de la Plata estuary. The local watershed supports agricultural activities and small-scale ecosystems. Effective secondary treatment reduces organic load and nutrients, safeguarding downstream water quality for aquatic life and human use.