Abstract: Corrosion and encrustation potentials of boreholes of Yola area northeastern Nigeria was investigated. The aim of this study was to discuss the results of groundwater quality assessment based on some Corrosion-Encrustation Index Parameters (CEIP) and drinking water standards. The concentration levels of cations were analyzed by spectrophotometric method whereas those of anions were by titrimetric method. The results of CEIP concentration indicate values of 6.5 to 7.8, 0 to 1.80 mg L-1 and 0 mg L-1, respectively for the pH, total iron and manganese ions. Furthermore results of 34 to 121 mg L-1, 0.02 to 2.80 mg L-1 and 10 to 140 mg L-1, respectively were recorded for Total Dissolved Solids (TDS), Dissolved Oxygen (DO) and Total Carbonate Hardness (TCH). Interpretation of these CEIP analytical results based on background values indicate low corrosion and encrustation risk and that borehole deterioration and failure is largely due to poor pump selection as well as use of inferior materials as riser pipes. On the other hand, corrosion and encrustation as a result of relatively high concentration of iron TCH and pH (>7) has been observed in few locations. These could be controlled through oxidation of soluble ferrous ions to insoluble ferric ion. The precipitates formed as a result will subsequently be removed by energetic flocculation, filtration and chlorination. Furthermore, conduction of pumping test prior to pump selection and installation and use of good quality materials as riser pipes is strongly recommended. Finally regular maintenance of boreholes involving air lifting, jetting, acid treatment and chlorination also is recommended.