ETE NORTE GUARACAI Wastewater Treatment Plant, Guaraçaí, São Paulo, Brazil

ETE NORTE GUARACAI is a wastewater treatment plant located in Guaraçaí, within the state of São Paulo, Brazil. The facility serves a population of approximately 4,658 residents, classifying it as a small-scale municipal treatment operation in the southeastern region of the country. The plant provides secondary treatment, which is the standard level required for Brazilian agglomerations under national regulations. Brazil's wastewater treatment framework, guided by CONAMA resolutions and state-level environmental agencies, mandates secondary treatment for urban areas to reduce organic load and protect water quality. The treated effluent is released into local water bodies that drain into the Paraná River basin, a major hydrological system in South America. This basin supports diverse aquatic ecosystems and provides water for agriculture, industry, and communities downstream. Proper treatment at ETE NORTE GUARACAI helps mitigate nutrient and pathogen pollution, contributing to the ecological health of the region.

The plant discharges into the Paraná River basin, which flows through southeastern Brazil and eventually reaches the Río de la Plata estuary. This watershed supports a variety of aquatic life, including migratory fish species, and is ecologically sensitive due to agricultural runoff and urban pressures. Effective secondary treatment reduces organic and nutrient loads, helping to maintain water quality in downstream environments.