The pollution of underground waters may determine restrictions in the water supplying of the inhabitants. In the Someş Plain, the three analyzed underground water bodies are characterized from a chemical point of view, being situated in the bicarbonate – calcic class, with various subclasses. In this study were used environment reports issued by the Counties Agencies for Environment Protection, respectively the Water management plans for Someş – Tisa and Crişuri water basins. The chronological analysis of the events that determined phreatic waters pollution, respectively, cases incidence and exceeding quantity, were made for the period 2002 – 2014, according to the available dat