of comparable impact is flooding with the highest water levels in spring in the area of lvov and busk towns in ukraine a high level of pollution by ammoniumnitrogen is observed in the ukrainian part in the light of hydrochemical indicators water quality got somewhat worse in as compared with which is consistent with a stable trend of deteriorating water quality as a result of the increase in discharges of nontreated and insufficiently treated urban and industrial wastewaters into the bug with the exception of ambukov located below the confluence of hutshva river where water was in quality category class iii ie clean water according to the ukrainian classification water quality has been in category class ie relatively clean water in the river section in ukraine close to the border with belarus the most commonly occurring quality problems in were phosphorus nitrates and metals belarus reports that water flowing from upstream has an elevated level of dissolved solids