ABSTRACT Periphyton is a microorganism that attached to a submerged substrate. This research aims to determine the trophic state of the inundated area in Batu Bersurat Village based on periphyton abundance. This research has been conducted in June-July 2019. There were 3 stations, namely S1 (settlements area and closed to palm plantation area), S2 (restaurant and settlements area), S3 (aro…