Summary:

The research work contains estimation of the low-retention reservoirs, Jasionówka and Czapielówka, pollution level. Both reservoirs are located within the region of Green Lungs of Poland in the Podlaskie region. The Czapielówka impounding reservoir, in the examined period of time, had higher level of phosphates abundance, in comparison to Jasionówka reservoir. Concentration of all inorganic forms of nitrogen in the surface layer, in both water regions meets standards of first quality class. In the aspect of iron and manganese we can classify both reservoirs to the second class. Considering the concentration of organic compound (presented as CODMn) in both reservoirs met the norms characteristic for third class. Considering CODCr, Jasionówka low-retention reservoir met standards characteristic for fourth class, and Czapielówka- for fifth class of surface water quality. Color indicators in both analyses water regions were characteristic for fourth/ fifth class. The analysis of investigated factors showed, that Jasionówka Water Reservoir characterized lower level of trophic state than Czapielówka Reservoir.