ETE Chacara Unidas - Secondary Wastewater Treatment Plant in Piracicaba, São Paulo

ETE Chacara Unidas is a wastewater treatment plant located in the Chacaras Unidas neighborhood of Piracicaba, in the state of São Paulo, Brazil. The plant serves a small population of 157 people, reflecting its role in a localized residential area within the broader Piracicaba metropolitan region. The plant provides secondary treatment, which is the standard biological treatment stage required for municipal wastewater in Brazil under national regulations. For small agglomerations like this, secondary treatment is typically sufficient to reduce organic matter and suspended solids before discharge. The plant treats an average daily flow of 35.00 m³, indicating a modest operational scale. The treated effluent is discharged into the local watershed, which ultimately drains into the Piracicaba River. This river is a key tributary of the Tietê River, one of the most important watercourses in São Paulo state, flowing into the Paraná River basin. The plant's operation helps protect downstream water quality in a region characterized by agricultural and urban land uses.

The plant discharges into the Piracicaba River basin, which flows into the Tietê River and eventually reaches the Paraná River. The Piracicaba River supports diverse aquatic life and is used for water supply, recreation, and irrigation. Downstream ecosystems benefit from the plant's secondary treatment, which reduces organic pollution and helps maintain ecological balance in a region with significant agricultural activity.