EN
Groundwater resources remain still in many locations the primary source of supply of drinking water for the population. This applies, in particular, to agricultural areas. That is why determination of conditions for transport of pollutants to groundwater and identification of the areas featuring the highest susceptibility to movement of these pollutants through the aeration zone is an especially significant task. The paper presents the characteristics of conditions of migration of pollutants to underground waters and the assessment of susceptibility of the aquifers to pollution of agricultural origin in the lowland basin of upper Wilga river. Resulting from classification, performed with application of methods of numerical taxonomy, four types (typological classes) were distinguished as to the conditions of pollutant migration to groundwater. These types correspond to, respectively, the least advantageous, moderate, advantageous and highly advantageous conditions for migration of pollutants to groundwater. The results obtained were compared to the results of chemical analyses of groundwater, carried out in the selected locations of the basin. High degree of agreement with PO₄⁻ measurements was observed. Significant local pollution level of the groundwater was noted in some locations. These pollutants are mainly of organic origin, resulting from the leaking septic tanks, or their lack altogether, the improper storage of manure, as well as the storage of faecal and livestock wastewater.