ETE Guaíra Wastewater Treatment Plant, Sumaré, São Paulo, Brazil

ETE Guaíra is a wastewater treatment plant located in Sumaré, within the state of São Paulo, Brazil. The facility serves a small population of 511 residents, providing secondary treatment to municipal wastewater. It is situated in the interior of São Paulo, away from the coast, and operates as part of the region's sanitation infrastructure. The plant employs secondary treatment, a standard biological process that removes organic matter and suspended solids. The plant's discharge volume of 129.60 cubic meters indicates its operational scale. In Brazil, wastewater treatment plants are regulated under federal environmental laws, with oversight by state agencies such as CETESB in São Paulo, which enforce discharge standards to protect water resources. The treated effluent from ETE Guaíra is discharged into local water bodies that drain into the Piracicaba River basin, a tributary of the Tietê River. The Tietê River flows through São Paulo state and ultimately reaches the Paraná River basin, which is ecologically significant for its biodiversity and supports agriculture and urban water supply. The plant's operation helps reduce pollution in this important watershed.

The plant's discharge enters the Piracicaba River basin, which flows into the Tietê River, a major waterway in São Paulo state. The Tietê River eventually joins the Paraná River, forming part of the La Plata Basin. This watershed supports diverse aquatic life and provides water for millions of people. Secondary treatment at ETE Guaíra helps mitigate nutrient and organic pollution, protecting downstream ecosystems and water quality.