ETE CARDOSO Wastewater Treatment Plant, Cardoso, São Paulo, Brazil

ETE CARDOSO is a municipal wastewater treatment plant located in Cardoso, within the state of São Paulo, Brazil. The facility serves a population of about 8,717 people, placing it in the small-to-medium agglomeration category for Brazilian sanitation infrastructure. Its location in the interior of São Paulo state places it within the Paraná River basin, a major hydrological system. As a Brazilian wastewater treatment plant, ETE CARDOSO is subject to CONAMA Resolution 430/2011 and state-level environmental regulations, which set effluent discharge standards for organic matter, solids, and nutrients. For a plant of this scale, secondary treatment is typically required to meet these standards. The treated effluent from ETE CARDOSO ultimately discharges into the Paraná River basin, which flows into the Río de la Plata estuary and the South Atlantic Ocean. This basin supports diverse aquatic life and is important for regional water supply and agriculture. Proper treatment at this facility helps protect downstream water quality in the Paraná system.

ETE CARDOSO discharges into the Paraná River basin, a major South American watershed that drains into the Río de la Plata estuary and the Atlantic Ocean. The basin supports diverse ecosystems, including wetlands and riparian forests, and is critical for regional biodiversity and water resources. The plant's location within 50 km of the coast (though not within 10 km) means its effluent contributes to the overall nutrient load reaching the estuary, making effective treatment important for coastal water quality.