Naima-Aithah area Southeast Tikrit-Iraq, suffer from draut and surface water shortage, the available groundwater is the strategic alternative to face this problem, so, this book aims to assess the groundwater quality and determine its suitability for different purposes in comparison with the international standard specifications, the evaluation indicate that the groundwater is suitable for irrigation, the hydrochemical properties of groundwater indicate that the water is not suitable for potable uses according to WHO criterion, but it is suitable for irrigation, animals drinking and for building purpose, I hope that the local people and the water well drilling agency, will benefit from this book for investigating the groundwater for suitable groundwater quality.