Abstract
The Bauru Aquifer System is one of the largest groundwater reservoirs of the São Paulo State and it is the most extensively and intensively exploited. Concentrations of nitrate, above the drinking water standard (10 mg/L NO3-N), were detected in several deep drilling and shallow (dug) wells, located at the urban areas of Bauru, Marília and Presidente Prudente cities, the mid-western regio…