ETE NOVA CASTILHO - Secondary Wastewater Treatment Plant in Nova Castilho, São Paulo

ETE NOVA CASTILHO is a municipal wastewater treatment plant located in Nova Castilho, within the São Paulo state of Brazil. The facility serves a small population of around 786 residents, reflecting its role in a rural or small-town setting. It operates under Brazil's national environmental regulations, which mandate secondary treatment for such agglomerations to protect water resources. The plant employs secondary treatment processes, which involve biological degradation of organic matter, ensuring that the effluent meets basic quality standards before discharge. With a daily discharge volume of 150.84 m³, the plant manages the wastewater generated by the local community. The plant's scale aligns with typical systems for small populations in the region. The treated effluent is discharged into local water bodies that ultimately 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 drinking. By treating wastewater, ETE NOVA CASTILHO helps reduce nutrient and pathogen loads, contributing to the ecological health of downstream rivers and reservoirs.

The plant's discharge enters local streams that flow into the Tietê River, a major tributary of the Paraná River basin. This basin is ecologically significant, supporting diverse fish species and providing water for the Pantanal wetlands downstream. The secondary treatment reduces organic pollution, helping to maintain water quality in a region where agriculture and urban development exert pressure on water resources.