ETE ASSISTENCIA Wastewater Treatment Plant, Rio Claro, São Paulo

ETE ASSISTENCIA is a wastewater treatment plant located in Rio Claro, within the state of São Paulo, Brazil. It serves a population of 2,687 people, classifying it as a small-scale facility. The plant is situated in the Região Metropolitana de Piracicaba, an area with significant agricultural and industrial activity. The plant provides secondary treatment, which is the standard level required for municipal wastewater in Brazil under CONAMA Resolution 430/2011. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into local water bodies that ultimately drain into the Piracicaba River basin, a tributary of the Tietê River. The Tietê River flows through São Paulo state and eventually reaches the Paraná River basin. The plant's operation helps protect downstream water quality in a region facing pressures from urbanization and agriculture.

The plant discharges into the Piracicaba River basin, which flows into the Tietê River and eventually the Paraná River system. The Piracicaba River supports diverse aquatic life and is used for water supply, recreation, and irrigation. The region's subtropical climate and agricultural runoff can stress water quality, making the plant's secondary treatment important for reducing organic pollution and protecting downstream ecosystems.