Abstract: Background and Objective: Geochemical and bacteriological analysis of water resources within some selected dumpsites in Imo State, Southeastern Nigeria was carried out to detect possible leachate contamination from the open dumpsites. The main objective was to determine the quality and potability of the water resources of the study area. Materials and Methods: A total of sixteen borehole and stream water samples were used in addition to four leachate samples collected within the dumpsites. Chemical analysis of the samples was carried out using standard procedures with the heavy metals analyzed using the atomic absorption spectroscopy (AAS), while bacterial analysis was carried out using the membrane filter technique. Descriptive statistical techniques including the mean and standard deviation of geochemical and bacteriological parameters were employed for statistical analysis. Results: The results of the study revealed that the concentrations in mg L–1 of Na+2, Mg+2, Ca+2, CO3–2 and HCO3‾ ions for both groundwater and surface samples have mean values of 4.65, 18.1, 87.67, 119 and 83.5 mg L–1, respectively. Iron (Fe+2), potassium (K+ ), nitrate (NO3‾) and lead (Pb+2) concentrations in the water samples were above the WHO 2010 permissible limits and ranged from 0.05-2.2, 0-23.3, 0.04-343 and 0–7 mg L–1, respectively. Bacteriological analysis revealed average values of 537, 215, 86 and 32 CFU/100 mL for total bacterial count, total coliform count, total faecal count and total E. coli, respectively indicating possible bacteriological contamination of the water resources in the vicinity of the dumpsites. Two dominant hydro geochemical facies (water types) were identified in the study area which included the Ca-Mg-Cl and Ca-SO4 water types. Conclusion: It was concluded that the high concentrations of potassium, nitrate, iron, lead and high occurrence of bacteria in the water resources of the study area indicate possible anthropogenic contamination from the nearby dumpsites. It was therefore, recommend that a better waste management approach be adopted for environmental protection and sustainability.