The article presents the results of the research on the water samples taken from the Krakow water

distribution system and their pollution by haloacetic acids: monochloroacetic acid, monobromoacetic acid, dichloroacetic acid, trichloroacetic acid, bromochloroacetic acid and dibromoacetic acid. The water samples were

taken from the extremities of the distribution systems (Raba and Bielany) in the city of Krakow. Both analyzed

plants use the chlorination as the water treatment process, however, water for Raba and Bielany comes from

different surface waters and differs in quality and organic matter concentration. These plants also apply different

water treatment processes and their distribution systems have a different size. The objective of this study was

to measure the haloacetic acids levels in these two water distribution systems, asses the correlation between the

total trihalomethanes and the sum of six haloacetic acids, determine if trihalomethanes can be a good indicator

to predict haloacetic acids concentration in water distribution systems.