Fluoride is one of the most abundant elements found in Ethiopian groundwater and in manyrnother parts of the world, posing a significant threat to the regionsâ€™ groundwater supply. Thernpresence of fluoride above the set limit of 1.5 mg/L in drinking water consumed by humans hasrnresulted in a variety of physical health issues such as dental and skeletal fluorosis. In thernEthiopian Rift Valley, nearly 8 million people drink fluoride-contaminated water. The samernproblem has been seen in other regions such as the Kenyan and Tanzanian Rift Valleys. Therncurrent study describes the preparation of a low-cost adsorbent using aluminium-modifiedrnactivated carbon prepared from Khat (Catha edulis) stem as well as its adsorption effectivenessrnfor fluoride ion removal from aqueous solution. The fluoride adsorption capacity of the resultingrnmodified adsorbent was experimentally evaluated with batch adsorption experiments inrnnumerous operating conditions, which include pH, adsorbent dose, and fluoride initialrnconcentration. The results showed that the modified activated carbon retained good fluoridernperformance; with an adsorbent dose of 2.47 g/L, 87.9 % of 2.1 mg/L initial fluoridernconcentration could be reduced from aqueous solution containing at pH 6.08 in 60 minutes. Thernadsorbent was applied to real drinking water samples collected from Tube, Wadesha, Dollessa,rnand Tejitu, and it was discovered that the concentrations of ground water collected from Tubernand Wadesha were reduced from 3.67 mg/L and 4.33 mg/L to 1.0 mg/L and 1.28 mg/L,rnrespectively, and are within WHO permissible drinking water limits. The scanning electronrnmicroscopy (SEM) and Fourier transform-infrared spectroscopy (FTIR) were used to describernmodified activated carbon and investigate the possible adsorption mechanism. The results showrnthat aluminium-modified activated carbon derived from khat (Catha edulis) has a reasonablerndefluoridating capacity and could be used as an appropriate and effective adsorbent for a longtermrnsolution to the fluoride problem in drinking water with lower fluoride concentrations.