 The reservoir supplies about 1.8 million people, and also is used for fishing and swimming.In addition to Rio Grande da Serra and São Paulo, the Billings sub-basin includes Diadema, Ribeirao Pires, Santo Andre, and Sao Bernardo do Campo.Besides the Rio Grande and Billings Reservoir and dam, the municipality has a lot of streams and creeks, such as the streams of Figueira, Cloro, and Piolzinho.