ETE SANEJ Wastewater Treatment Plant, Jau, Sao Paulo, Brazil

ETE SANEJ is a wastewater treatment plant located in Jau, within the state of Sao Paulo, Brazil. The plant serves a population of approximately 117,000 people, placing it in the medium-to-large agglomeration category for Brazilian sanitation systems. Jau is situated in the interior of Sao Paulo state, in the Bauru intermediate geographic region. As a plant of this scale, ETE SANEJ is subject to Brazilian federal regulations under CONAMA resolutions and state-level environmental licensing by CETESB, Sao Paulo's environmental agency. These regulations typically require secondary treatment for municipal wastewater to protect receiving water bodies. The regulatory framework ensures that facilities serving populations over 100,000 must meet stringent effluent standards to prevent pollution. The treated effluent from ETE SANEJ is discharged into local watercourses that ultimately drain into the Tiete River basin, one of the most important river systems in Sao Paulo state. The Tiete River flows westward to join the Parana River, which forms part of the La Plata Basin, eventually reaching the Atlantic Ocean. The plant plays a critical role in protecting downstream water quality and aquatic ecosystems in this densely populated and industrialized region.

ETE SANEJ discharges into the Tiete River basin, which flows into the Parana River and eventually the Rio de la Plata estuary. The Tiete River is a major waterway in Sao Paulo state, supporting diverse aquatic life and providing water for agriculture, industry, and drinking water downstream. The plant's treatment helps reduce nutrient and organic loads that could otherwise cause eutrophication and oxygen depletion in receiving waters.