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Groundwater is one of the main resources for drinking- and industrial water supply in Bulgaria. Investigations of a number of groundwater sources indicate concentrations of toxic elements or metal ions, considerably exceeding the maximum contaminant values. Pollution with arsenic has been found in the region of Dimitrovgrad, Merichleri, Haskovo, Kyustendil. Increased content of manganese, iron and sulphates is available in some districts of Sofia, Dimitrovgrad, Haskovo, Svishtov. Presence of excessive concentratio...