Considering the fact that water quality monitoring programs in Poland are mostly based on physicochemical variables and saprobie systems, it is important to evaluate also the possibility of applying biotic index methods for water quality assessment. The investigation was carried out at the Ścinawa Niemodlińska river (Opole Voivodeship). Benthic macroinvertebrates from seven sampling sites were sampled twice in 1999. Belgian Biotic Index values were calculated on the basis of the results of qualitative and quantitative analyses of the macroinvertebrate community, as the example of the biotic index application. BBi values indicated a low, but different in particular sites, pollution level of the studied ecosystem.