The groundwater potential assessment of Teji river catchment is important to the currentlyrnincreasing demand of water resources for different developmental activities and itsrnquantification is vital for the efficient and sustainable groundwater resource management.rnThe most important parameter contributing to recharge in the area are rainfall,rnevapotranspiration rate, and soil types. The area has an annual rainfall of 1104mm.rnQuantification of potential and actual evapotranspiration of the area is made usingrndifferent techniques. The results obtained from are compared and representative one isrndetermined to the area and qualitatively described. Water balance studies of therncatchment indicate that 325.39mm of water is recharged annually and the monthsrnOctober, November, December, January, February, March, April, and May have soilrnmoisture deficit and the remaining months are soil moisture surplus.rnThe main aquifer identified in the catchment is alluvial sediment, weathered and fracturedrnignimbrite, and weathered and fractured basalt.rnGraphical presentation using Piper, Shoeller, Stiff and Wilcox diagram have been usedrnfor the effective analyses and interpretation of data. The groundwater in the catchment isrncharacterized by Ca-Mg-Hco3, Ca-Na-Hco3, Ca-Hco3 and Na-Hco3-cl type water. TDS,rnEC and PH values range 184mg/l-566mg/l, 354Î¼s/cm-838Î¼s/cm and 6.6-7.68rnrespectively. The water sample analyses made in the catchment indicate the water isrnsuitable for domestic and agricultural purpose. Almost all the water samples analyzed arernwith in the limits of WHO water quality standards except bore holes drilled at UrogotadernPAâ€™s (fluoride = 1.68mg/l) and Asgori town (fluoride = 2.01mg/l & iron=0.39mg/l).