ETE MENDONCA Wastewater Treatment Plant, Mendonça, São Paulo, Brazil

ETE MENDONCA is a municipal wastewater treatment plant located in Mendonça, a city in the state of São Paulo, Brazil. The plant serves a population of about 4,000 residents, classifying it as a small-scale facility within the region's sanitation infrastructure. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. Secondary treatment aligns with Brazilian regulatory requirements for communities of this size, typically involving activated sludge or similar systems. The plant discharges approximately 729.25 cubic meters of treated wastewater daily. Located within 10 km of the coast, the plant's effluent ultimately reaches the Atlantic Ocean via local waterways. The surrounding region is part of the Paraná River basin, which supports diverse aquatic ecosystems and is important for agriculture and water supply. Proper treatment helps protect downstream water quality and marine environments.

The plant discharges into local streams that flow into the Paraná River basin, eventually reaching the Atlantic Ocean. The coastal proximity means treated effluent can influence estuarine and marine habitats, which support fish populations and migratory species. Maintaining secondary treatment reduces nutrient loading and protects sensitive coastal ecosystems.