ETE ALTO PARNAIBA Wastewater Treatment Plant, Santa Filomena, Piauí

ETE ALTO PARNAIBA is a wastewater treatment plant located in Santa Filomena, in the state of Piauí, Brazil. The plant serves a small population of 761 residents, reflecting its role in a rural or small-town setting within the Região Geográfica Imediata de Corrente. As a small-scale facility in Brazil, the plant is subject to national environmental regulations, including CONAMA resolutions and state-level water quality standards. For agglomerations of this size, secondary treatment is typically expected to reduce organic load and protect receiving waters. Its operation aligns with local permitting requirements. The plant discharges treated wastewater into local water bodies that drain into the Parnaíba River basin, which flows northward to the Atlantic Ocean. The Parnaíba River is a major watercourse in northeastern Brazil, supporting diverse aquatic life and providing water for agriculture and communities. The plant's operations help maintain water quality in this ecologically important basin.

The plant's treated effluent enters local streams that feed into the Parnaíba River basin. The Parnaíba River is one of the largest rivers in northeastern Brazil, flowing into the Atlantic Ocean through a delta region. This watershed supports diverse aquatic ecosystems, including fish species and riparian vegetation, and is important for local livelihoods. Protecting water quality in this basin is critical for maintaining ecological balance and human use.