ETE Engenheiro Coelho Wastewater Treatment Plant, Engenheiro Coelho, São Paulo, Brazil

ETE Engenheiro Coelho is a municipal wastewater treatment plant located in Engenheiro Coelho, a city in the state of São Paulo, Brazil. The plant serves a population of approximately 14,000 residents, classifying it as a small to medium-sized facility within the region's sanitation infrastructure. Brazil's wastewater treatment standards are governed by CONAMA Resolution 430/2011 and the National Water Resources Policy (Law 9.433/1997). For plants serving communities of this scale, secondary treatment is typically required to reduce organic load and suspended solids before discharge. The plant discharges treated effluent into local water bodies within the Piracicaba River basin, which flows into the Tietê River and ultimately reaches the Paraná River system. This basin supports diverse aquatic life and provides water for agricultural and urban uses downstream.

The plant's treated effluent enters the Piracicaba River basin, a tributary of the Tietê River, which flows through São Paulo state and joins the Paraná River. The Paraná River is a major South American waterway that drains into the Río de la Plata estuary. The watershed supports ecologically sensitive areas, including riparian forests and wetlands that provide habitat for fish and migratory birds.