In the reservoirs of the Dnieper cascade, a decrease in mean annual cesium-137 and strontium-90 concentrations is observed. According to the classification of water resources adopted in Belarus, 76.1% of water in the basin is classified as "relatively clean", 19.7% as "moderately polluted", 1.4% as "polluted" and 2.8% as "dirty". Main pollutants are nutrients (nitrogen compounds), organic substances (including phenols) and heavy metals.