Twenty ground water samples were collected from twenty selected wells distributed over all the area in Khanaqin district, Diyala governorate, Northeast of Iraq during June 2018. In the study area, Mukdadiya and Bai Hassan Formations and Quaternary sediments represent the chief aquifers. The aquafer type is unconfined. The groundwater samples were analyzed for total dissolved solids (TDS), Ph, electrical conductivity (EC), major cations (K+, Na+, Mg++, Ca++) and anions (SO4--, Cl-, HCO3-). The hydro-chemical analysis results showed 4the ground water in the study area having high TDS and EC values. The ground water is classified as brackish water except samples (S1, S4, S6, S13 and S19) are classified as Fresh water. Depending on Schoeller classifications, most of the studied samples demonstrated as water type of CaSO4 while other samples have ranged between MgSO4 and NaSO4 water type. Most of the studied wells showed a meteoric source except well samples (S1, S4 and S14) have a marine water origin. The application of Bojarski method shows that the all ground water samples have a high hydrodynamic activity so that the hydro-carbonic accumulation is a little, except samples (S1 and S4). This indication comes and from the values of Na/Cl ratio, which these values were more than 0.85 and less than 0.5 respectively. The ratio of marine water origin is subjected to contamination of contiguous hydrocarbons, especially those with marine origins. All the groundwater samples in khanaqin area are unsatisfied for industrial usages except samples (S1, S10 and S13) are suitable for some industrial uses