ETE I Santa Terezinha de Itaipu - Wastewater Treatment Plant in Santa Terezinha de Itaipu, Paraná, Brazil

ETE I Santa Terezinha de Itaipu is a municipal wastewater treatment plant located in Santa Terezinha de Itaipu, a city in the state of Paraná, Brazil. The plant serves a population of approximately 7,572 residents, classifying it as a small to medium agglomeration under Brazilian wastewater management frameworks. Brazil's wastewater treatment regulations are governed by the National Environmental Council (CONAMA) and state-level environmental agencies. For plants of this scale, secondary treatment is typically required to meet effluent standards before discharge. The plant's designed capacity is 1.00 (likely in cubic meters per second or similar unit), indicating a modest infrastructure footprint. The plant's treated effluent ultimately drains into the Iguaçu River basin, which flows into the Paraná River and eventually reaches the Río de la Plata estuary. This watershed supports diverse aquatic ecosystems and is important for regional water supply and biodiversity. The proximity to the Iguaçu National Park and the Itaipu Dam adds ecological significance to the area.

The plant discharges into the Iguaçu River basin, a major tributary of the Paraná River. The Paraná River flows southward to form the Río de la Plata estuary, which supports rich aquatic life and migratory fish species. The region's subtropical climate and proximity to the Atlantic Forest biome make water quality management critical for downstream ecosystems, including wetlands and riparian habitats.