ETE Salto Grande Wastewater Treatment Plant, Salto Grande, São Paulo

ETE Salto Grande is a municipal wastewater treatment plant located in Vila São João, Salto Grande, within the state of São Paulo, Brazil. The facility serves a population of approximately 7,853 residents, classifying it as a small agglomeration under typical regulatory frameworks. The plant provides secondary treatment, which is the standard level required for most urban wastewater in Brazil under CONAMA Resolution 430/2011 and state-level regulations. Secondary treatment effectively removes organic matter and suspended solids, reducing the pollutant load before discharge. The treated effluent is discharged into local water bodies that ultimately drain into the Paranapanema River basin, a major tributary of the Paraná River. This river system supports diverse aquatic life and is important for regional water supply and agriculture. The plant's operation helps protect downstream water quality in this ecologically significant watershed.

The plant discharges into the Paranapanema River basin, which flows into the Paraná River and eventually reaches the Río de la Plata estuary. This watershed supports diverse aquatic ecosystems, including fish species important for local fisheries. The secondary treatment provided by ETE Salto Grande helps reduce nutrient and organic pollution, mitigating eutrophication risks in downstream water bodies.