Abstract
In order to determine the benthic macro invertebrates communities role as bioindicators, researchers worldwide carried out analyses into the structure, dynamics and diversity of the different groups as well as into the physical-chemical factors. A total of twenty one species of caddisfly larvae were identified in the study. Numerical abundance, frequency and diversity values recorded for the caddisfly species varied according to the physicalchemical conditions specific to each sample collecting station. The physical and chemical parameters monitored in Timiș River water catchment basin have corresponded with the limits of the Ministry of Environment and Water Management (MEWA) Order 161/2006, which states the ecological status of surface bodies of water with, few exceptions being identified.