ETE Emilianópolis Wastewater Treatment Plant, Emilianópolis, São Paulo

ETE Emilianópolis is a municipal wastewater treatment plant located in Emilianópolis, within the Presidente Prudente region of São Paulo state, Brazil. The facility serves a population of approximately 2,554 residents, classifying it as a small-scale treatment operation in the southeastern region of the country. The plant provides secondary treatment, which is the standard biological process required for small to medium agglomerations under Brazilian regulations (CONAMA resolutions). Secondary treatment typically involves biological degradation of organic matter followed by sedimentation. The plant discharges an average of 320.08 m³ of treated effluent per day. The treated wastewater from ETE Emilianópolis 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 drinking water downstream. Proper treatment helps protect water quality in this ecologically and economically important watershed.

The plant's effluent enters small streams within the Paraná River basin, which flows through southeastern Brazil and into the Río de la Plata estuary. This watershed supports diverse aquatic life, including migratory fish species, and is vital for regional water supply. The secondary treatment provided helps reduce organic pollution and nutrient loads, protecting downstream water quality in this agriculturally intensive region.