The physicochemical and water quality assessment of borehole water sources of Ishiagu, southestern region of Nigeria was investigated to ascertain the portability, suitability and quality of the water used for drinking and other domestic purposes. Sampling was done twice every month in each of the selected nine stations which lasted for six months. Some experiments were carried out in-situ for Temperature, pH, Electrical conductivity (EC), Total dissolved solid (TDS), and Dissolved Oxygen (DO), while rest of the other parameters were carried out in the laboratory. From the analysis results, the borehole water sources selected recorded the average pH values that is within the WHO/SON acceptable limits. The results obtained for the mean WQI of the nine different stations ranges from 41.78 to 67.37, which further revealed that 44% of the stations had good water quality for drinking while 56% of the stations uses poor water quality which may require pre-treatment before drinking. The high WQI values in some stations signifies high level of deterioration which mainly could be due to higher values of turbidity

Keywords : Water quality index (WQI), physicochemical parameters, borehole water, drinking, Ishiagu.