ETE OCAUCU Wastewater Treatment Plant, Ocauçu, São Paulo, Brazil

ETE OCAUCU is a municipal wastewater treatment plant located in Ocauçu, a municipality in the state of São Paulo, Brazil. The plant serves a population of approximately 3,369 people, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard level required under Brazilian regulations (CONAMA Resolution 430/2011) for inland water bodies. This process typically involves biological treatment to reduce organic matter and suspended solids. The plant discharges a daily volume of 555.50 cubic meters of treated effluent. The treated wastewater is released into local watercourses that drain into the Paraná River basin, one of South America's major hydrological systems. The downstream environment supports diverse aquatic life and is used for agriculture and water supply. Proper treatment is essential to protect water quality in this ecologically important basin.

The plant discharges into local streams that flow into the Paraná River basin, which ultimately reaches the Río de la Plata estuary. The region's watershed supports agricultural activities and provides habitat for fish and other aquatic species. Effective secondary treatment helps prevent nutrient pollution and maintains the ecological health of downstream water bodies.