The paper presents the results of investigations of the occurrence of water beetles in natural and artificial water bodies in the area of Szczecin. Altogether 6266 individuals of water beetles belonging to 132 species from 6 families were collected. Analyses were made of species structure, changes in the population of the fauna in the annual cycle, and faunal similarities between the water bodies. The main source of the fauna of Coleoptera of the urban waters were the natural water bodies and waters of the Baltic littoral.