This situation pertains to about 70 per cent of the municipalities of Vojvodina, which are using wells for public water supply, and about 50 per cent of the total population of the Autonomous Province. Arsenic removal from drinking water requires significant financial resources and specific units of water treatment, which are necessary to develop an appropriate plan to address this problem. According to data from the Institute of Public Health of Belgrade City in 2013, the physico-chemical and microbiological parameters were controlled in 6,891 samples, of which 0.63 per cent did not meet physico-chemical parameters and 2.74 per cent did not meet microbiological parameters. Beogradvode” also controls water quality through analysis of an additional 8,000 or so samples per year, but results are not known since it has no obligation to submit them.