ETE 1 BARRETOS 2 Wastewater Treatment Plant, Barretos, São Paulo

ETE 1 BARRETOS 2 is a wastewater treatment plant located in Barretos, a city in the state of São Paulo, Brazil. The plant serves a population of about 21,800 residents, classifying it as a medium-sized facility within the region's sanitation infrastructure. Brazil's wastewater treatment standards are governed by CONAMA Resolution 430/2011 and the National Water Resources Policy (Law 9.433/1997). For agglomerations of this scale, secondary treatment is typically required to reduce organic load and suspended solids before discharge. It is expected to meet these national effluent quality standards. The plant discharges treated effluent into local water bodies that ultimately drain into the Rio Grande, a major tributary of the Paraná River basin. This basin supports diverse aquatic life and provides water for agriculture and urban use downstream. Proper treatment at ETE 1 BARRETOS 2 helps protect water quality in the region's rivers and reservoirs.

The treated effluent from ETE 1 BARRETOS 2 flows into local streams that are part of the Rio Grande watershed, which drains into the Paraná River basin. This basin is ecologically significant, supporting diverse fish species and providing water for irrigation and drinking water supply. The region's tropical climate and agricultural activity make nutrient management important to prevent eutrophication in downstream reservoirs.