ETE Ilha Solteira Wastewater Treatment Plant, Ilha Solteira, São Paulo

ETE Ilha Solteira is a municipal wastewater treatment plant located in Ilha Solteira, a city in the state of São Paulo, Brazil. The plant serves a population of around 23,000 residents, placing it in the medium agglomeration category for Brazilian wastewater infrastructure. Under Brazilian regulations, wastewater treatment plants serving populations of this size are typically required to meet secondary treatment standards as per CONAMA Resolution 430/2011, which sets effluent quality parameters for discharge into water bodies. The plant discharges into the local watershed, which is part of the Paraná River basin. The treated effluent ultimately flows into the Paraná River, one of South America's major rivers, supporting diverse aquatic ecosystems and providing water for downstream communities.

The plant is located inland in the Paraná River basin, approximately 50 km from the Paraná River mainstem. The receiving water body is likely a local stream or tributary that drains into the Paraná River, which flows into the Río de la Plata estuary. The watershed supports diverse aquatic life, including migratory fish species, and is important for regional water supply and agriculture.