ETE Lagoinha SP Wastewater Treatment Plant - Lagoinha, São Paulo

ETE Lagoinha SP is a municipal wastewater treatment facility located in Lagoinha, within the state of São Paulo, Brazil. The plant serves a population of approximately 2,830 residents, classifying it as a small-scale treatment facility in the region. The plant provides secondary treatment, which is the standard level required under Brazilian regulations for communities of this size. With a discharge volume of 347.15 m³/day, the facility operates within the framework of Brazil's environmental licensing system, overseen by state environmental agencies such as CETESB in São Paulo. The treated effluent is discharged into the local water system, which drains into the Paraíba do Sul River basin. This river is a vital water resource for the region, supporting agriculture, industry, and drinking water supplies downstream. The plant plays a key role in protecting water quality in this ecologically important basin.

The plant discharges into the Paraíba do Sul River basin, which flows through the Vale do Paraíba region and ultimately reaches the Atlantic Ocean near Campos dos Goytacazes. The river supports diverse aquatic life and is a critical water source for millions of people. Secondary treatment helps reduce organic pollutants and nutrients, mitigating eutrophication risks in downstream reservoirs and coastal waters.