In this thesis work, attempts were made to link water quality with hydrophilic communities. To this end, seasonal sampling was carried out in one of the most problematic streams in the city of Neuquén, the Duran stream, a rainvioluvional stream that crosses the city and flows into the Limay river. Throughout its journey, it receives clandestine inputs of domestic and industrial effluent from organic and inorganic sources, which shows significant contamination in this water body. Three sampling sites were considered, one representing the passage of the stream Duran through the rural area, the second after crossing the urban area, before flowing into the river, and a third control site, in the waters of the Limay river. Physico-chemical parameters and biological parameters were measured, the latter corresponding to hydrophite communities. The results of physico-chemical analyses although no alarming values were presented, with the exception of phosphorus, showed seasonal nutrient enrichment. For hydrophytes, two indices were used for analysis, Macrophyte Index (IM) and Macroscopic Aquatic Vegetation Index — Genus (IVAM-G), both classified as poor or poor quality water from the stream Duran, with a higher incidence in autumn and winter, which coincided with the highest physico-chemical parameters. It was also noted that the increased coverage of hydrotrophic species was presented in warm seasons (summer and spring), coinciding with the favourable growth times of the plants. FIL: Arévalo Pérez, Lorena Edith. National University of the Comahue. Faculty of Environment and Health Sciences; Argentina