The Quilombo River is classified as below Classe 4 (the lowest classification, indicating its danger, the inability for life to exist in it). We saw the water flowing from downtown Americana and it looked terrible: so grey, polluted, and oily. Dyes and other industrial runoff go directly into the river. Where we saw the Quilombo meet the Piracicaba River, the sulfuric smell was deathly. The allegedly “treated” water was spewing out into the river and still looked and smelled full of sewage and other mystery pollutants. Wretched.