In 1999, in comparison to 1979, oxygen conditions in the Przemsza River improved. The maximal concentrations of BOD decreased about 20 times, whereas minimal concentrations from 3 to 10 times. On the basic changes of COD it was found that the quantity of recalcitrant pollutants is the same as 10 years ago, the salinity of water is also the same. The volume of ammonia and nitrites has decreased. The probable cause of decrease of nitrates was the reduction of fertilisers levels in the basin area of the Przemsza River. The suspended solids concentrations in the water are abatemanted. The water quality of the river gets worse along the river, coupe especially near the towns of Mysłowice and Jelen.