 With proper care, these waters are also suitable for the protection of aquatic communities, primary contact recreation, fruit plants and irrigation of vegetables, and natural creation and / or intensive species for human consumption.However, these rivers are very polluted, being compared to sewage ditches in the open, with indicative serious organic and faecal pollution and heavy metals such as nickel and lead.According FEEMA, it appears, also, the presence of cadmium, chromium and iron.