ETE Macedonia Wastewater Treatment Plant, Macedônia, São Paulo, Brazil

ETE Macedonia is a wastewater treatment plant located in Macedônia, a municipality in the state of São Paulo, Brazil. The plant serves a population of approximately 2,673 residents, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard biological process required by Brazilian regulations for most urban wastewater. Under the National Environmental Council (CONAMA) resolutions and state-level permits, secondary treatment ensures removal of organic matter and suspended solids. The plant discharges an annual volume of 366.89 thousand m³ of treated effluent. Despite being inland, the plant is within 10 km of the coast, indicating its discharge may ultimately reach coastal waters via local drainage. The region drains into the Paraná River basin, which flows to the Río de la Plata estuary. Proper treatment helps protect downstream aquatic ecosystems and water quality.

The plant's treated effluent likely enters local streams that feed into the Paraná River basin, one of South America's major river systems. The Paraná River flows southward through Brazil, Paraguay, and Argentina, eventually reaching the Río de la Plata estuary. This watershed supports diverse aquatic life and provides water for agriculture and human consumption. Secondary treatment reduces organic pollution, helping to maintain ecological balance in downstream waters.