ETE SANTANA VII Wastewater Treatment Plant, Piracicaba, São Paulo

ETE SANTANA VII is a wastewater treatment plant located in the Santa Terezinha neighborhood of Piracicaba, in the state of São Paulo, Brazil. It serves a small population of 116 residents, reflecting its role in a localized community within the broader Piracicaba metropolitan area. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. In Brazil, wastewater treatment is regulated by federal and state environmental agencies, with CONAMA resolutions setting discharge standards. For small plants like this, secondary treatment is typically sufficient to meet effluent quality requirements before discharge. The treated effluent is discharged into local water bodies that eventually flow into the Piracicaba River, a major tributary of the Tietê River basin. The Tietê River drains into the Paraná River system, ultimately reaching the Río de la Plata estuary. This watershed supports diverse aquatic life and is important for regional water supply and agriculture.

The plant discharges into the Piracicaba River basin, part of the larger Tietê River watershed that flows through São Paulo state. The Tietê River is a key water source for the region, supporting ecosystems and human activities. Downstream, the river joins the Paraná River, which empties into the Río de la Plata estuary. The area is ecologically sensitive due to urban and agricultural runoff, and the plant's secondary treatment helps reduce organic pollution in this important waterway.