ETE Jardim Japao - Wastewater Treatment Plant in Cotia, São Paulo, Brazil

ETE Jardim Japao is a wastewater treatment facility located in Cotia, within the São Paulo metropolitan region, Brazil. The plant serves a population of about 22,500 residents, contributing to the sanitation infrastructure of this rapidly urbanizing area. The plant operates under Brazil's regulatory framework, which includes CONAMA resolutions and state-level environmental licensing. For agglomerations of this scale, secondary treatment is typically required to meet effluent standards for organic matter and suspended solids. The treated effluent is discharged into local watercourses that drain into the Tietê River basin, a major tributary of the Paraná River system. This watershed supports diverse aquatic life and provides water for downstream communities, making effective treatment essential for protecting regional water quality.

The plant discharges into streams that flow into the Tietê River, which traverses the São Paulo metropolitan area and eventually joins the Paraná River. The Tietê River basin is ecologically significant, supporting fish populations and riparian habitats. Downstream, the Paraná River feeds the La Plata Basin, one of South America's largest watersheds. Effective wastewater treatment is critical to prevent nutrient loading and contamination that could impact aquatic ecosystems and water supply for millions of people.