ETE Sandovalina Wastewater Treatment Plant, Sandovalina, São Paulo, Brazil

ETE Sandovalina is a wastewater treatment plant located in Sandovalina, a municipality in the state of São Paulo, Brazil. The plant serves a population of 2,747, classifying it as a small-scale facility within the region's sanitation infrastructure. It is situated inland, away from coastal areas, and discharges treated effluent into local water bodies. The plant provides secondary treatment, which is the standard level required under Brazilian regulations for municipalities of this size. Brazil's National Environmental Council (CONAMA) and state environmental agencies set discharge standards that typically mandate secondary treatment to reduce organic load and suspended solids. The treated wastewater from ETE Sandovalina ultimately flows into the Paraná River basin, one of South America's major river systems. The Paraná River drains into the Río de la Plata estuary, supporting diverse aquatic ecosystems and providing water for agriculture, industry, and human consumption. Proper treatment at this plant helps protect downstream water quality and ecological health.

The plant discharges into the Paraná River basin, which flows through southeastern Brazil, Paraguay, and Argentina before reaching the Río de la Plata estuary. This basin supports a rich diversity of fish species and is an important migratory corridor for aquatic life. The surrounding region is characterized by agricultural activity, and the plant's secondary treatment helps mitigate nutrient and organic pollution that could otherwise impact downstream ecosystems and water users.