ETE SAO MIGUEL ARCANJO Wastewater Treatment Plant, São Miguel Arcanjo, São Paulo

ETE SAO MIGUEL ARCANJO is a wastewater treatment plant located in São Miguel Arcanjo, a municipality in the state of São Paulo, Brazil. The plant serves a population of approximately 16,683 people, placing it in the medium-agglomeration category under Brazilian regulatory frameworks. It is situated in the Região Metropolitana de Sorocaba, an area with growing urban and industrial activity. Brazilian wastewater treatment plants of this scale are typically required to meet secondary treatment standards under CONAMA Resolution 430/2011, which sets effluent quality parameters for discharge into water bodies. The regulatory context ensures that facilities serving populations over 10,000 must implement adequate treatment to protect receiving waters. The plant discharges into local watercourses that drain into the Paranapanema River basin, part of the larger Paraná River system. This basin supports diverse aquatic ecosystems and is important for regional water supply and agriculture. The plant's operation contributes to protecting downstream water quality in the Paranapanema River and ultimately the Rio de la Plata estuary.

The plant's treated effluent flows into tributaries of the Paranapanema River, which is a major tributary of the Paraná River. The Paranapanema basin supports rich biodiversity, including fish species and riparian forests. Downstream, the Paraná River feeds the Rio de la Plata estuary, a critical habitat for migratory fish and aquatic birds. Effective wastewater treatment is essential to prevent nutrient loading and maintain water quality in this ecologically sensitive watershed.