ETE Matadouro Guaíra - Wastewater Treatment Plant in Guaíra, São Paulo, Brazil

ETE Matadouro Guaíra is a wastewater treatment facility located in the Vivendas neighborhood of Guaíra, a city in the state of São Paulo, Brazil. The plant serves a population of around 13,024 people, placing it in the small-to-medium agglomeration category for Brazilian wastewater infrastructure. Brazil's wastewater treatment standards are governed by CONAMA Resolution 430/2011 and state-level regulations, which require adequate treatment to protect water quality. For plants of this scale, secondary treatment is typically expected to reduce organic load and suspended solids before discharge. It is part of the municipal sanitation system managed by local authorities. The treated effluent from ETE Matadouro Guaíra is discharged into a local watercourse that flows into the Rio Grande, a major tributary of the Paraná River basin. This basin supports diverse aquatic ecosystems and is important for agriculture, water supply, and hydropower generation in southeastern Brazil. Proper treatment at this plant helps protect downstream water quality and ecological health.

The plant discharges into a tributary of the Rio Grande, which flows into the Paraná River basin, one of South America's largest watersheds. The Paraná River ultimately drains into the Río de la Plata estuary. The region's aquatic ecosystems support diverse fish species and migratory birds, and the river is used for irrigation and drinking water supply. Effective wastewater treatment is critical to prevent nutrient pollution and maintain water quality in this ecologically and economically important basin.