Heavy metals in drinking water on geochemical provinces in the Perm region as factors of carcinogenic risk to protect public health

Pairing data on geochemical provinces in the Perm region and the locations of a number of surface water intakes possible to distinguish several major water sources of drinking water supply, located in areas with high natural concentrations of heavy metals - cadmium, nickel, lead, chromium and arsenic. Found that the presence of metals, even if their year average level is less than hygienic standards, causes unacceptable carcinogenic risk to the health of the population (from 7.35 * 10 -4 to 4.0 * 10 -3), which requires additional sanitary measures to protect public health. Results of preliminary analysis of prevalence tumors in investigated areas indicates the possibility of the realization of these risks.