As one part of a flowing freshwater ecosystem, Rivers can carry various elements or nutrients needed for life in and around its flow. This research was conducted on Thursday-Sunday 13-16 September 2021 on the Cigalugur River at Cihuni Irrigation Station, Warung Kadu Station, Central Nagri Station, and Cipaisan Station, Purwakarta, West Java. Benthos is taking with hand-sorting and surfer method. The results of monitoring the quality of waters along the Cigalugur river flow at four stations have the same Trent Biotic Index (TBI) value, an index of VIII. This situation shows that the level of pollution of the Cigalugur river waters is still low, species diversity is on average, and the community is stable.