Seawater intrusion is a worldwide phenomenon resulting in groundwater quality challenges in coastal aquifers, which has prompted many investigations into its occurrence, sources, and age. To identify the origin of saline groundwater in the coastal communities of Central Region, Ghana, a combination of ten (10) different major ionic ratios—viz. Na/Cl, Mg/Cl, Ca/Mg, K/Cl, SO₄/Cl, Ca/ (HCO₃ + SO₄), (Ca + Mg)/Cl, Cl/ (SO₄ + HCO₃), Na/Ca and Ca/SO₄–and Base Exchange Index (BEX) computed from physico-chemical data on sixty-nine (69) boreholes in the communities have been analysed. The results show elevated levels of chloride concentrations in most of the groundwater in the study area, indicating salinization process by seawater intrusion. Also, the concentrations of the major ions (Na⁺, Ca²⁺, Mg²⁺, and SO₄²⁻) constituted more than 80% of the total dissolved solids and correlated well with Cl⁻, indicating they are from a common source. The spatial variation of the combined effect of the different ionic ratios and BEX classifications showed that, most of the groundwater with high salinity may be due to seawater intrusion. Significantly, the study has delineated areas in the communities with poor groundwater quality arising from seawater intrusion; these areas need to be avoided in the development of the resource for water supply.

海水入侵是一种全球性现象，导致沿海含水层面临地下水质量挑战，这促使人们对其发生，来源和年龄进行了许多调查。为了确定加纳中部沿海地区盐碱地下水的起源，需要结合十（10）个不同的主要离子比率。Na / Cl，Mg / Cl，Ca / Mg，K / Cl，SO ₄ / Cl，Ca /（HCO ₃  + SO ₄），（Ca + Mg）/ Cl，Cl /（SO ₄  + HCO ₃），Na / Ca和Ca / SO ₄-并且分析了根据社区中六十九（69）个井眼的理化数据计算出的基础交换指数（BEX）。结果表明，研究区域大部分地下水中的氯离子浓度升高，表明海水入侵导致盐碱化过程。另外，主要离子（Na ⁺，Ca 2 ⁺，Mg ²⁺和SO ₄ ^2-）的浓度占总溶解固体的80％以上，并且与Cl-很好地相关^。，表示它们来自同一来源。不同离子比和BEX分类的综合作用的空间变化表明，大多数具有高盐度的地下水可能是由于海水入侵造成的。重要的是，该研究划定了社区中因海水入侵而地下水质量较差的地区。在开发供水资源时需要避免这些领域。