Results were compared with the control and regulatory standards Nigerian Industrial Standard for Drinking Water Quality (NISDQW) and World Health Organization (WHO) guidelines for drinking water quality. Sanitary inspection was also carried out at each well location. Analysis of water for some physico-chemical parameters (pH, TDS, Electrical Conductivity, Alkalinity, Oil and Grease) and the heavy metals (Cu, Cd, Cr, and Pb) was done using standard methods. A residential area was selected as the control site. Water samples were collected from hand dug wells situated within 0 to 50 metres in twenty auto-mobile workshops randomly selected across three zones. We assessed the effect of activities of mechanics in auto-mobile workshops on the quality of groundwater sources. The detrimental effect of the activities in informal auto-mobile mechanic workshops is a major public health concern and its impact on groundwater contamination cannot be ignored.
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