The hydrochemistry of groundwater samples from the northern part of coastal Sindhudurg district, Maharashtra, India, was studied with an aim to comprehend its suitability for domestic and irrigation use. Groundwater samples were collected from 66 dug wells distributed over the study area, during the month of November 2017. The results of the chemical analysis indicate that the groundwater is alkaline in nature and are mainly characterized by Ca⁺-Mg⁺²-HCO₃⁻ Ca⁺-Mg⁺²-Cl⁻ and Na⁺-Cl⁻ facies. The molar ratios of Na⁺/Cl⁻>1, both Mg²⁺/Na⁺ and Ca²⁺/Na⁺ ratios <1, (Ca²⁺ + Mg²⁺)/(SO₄²⁻ + HCO₃⁻) = 1 suggest that the rock-water interaction of silicates/schistose rocks (quartz, chlorite, amphibolites, schist etc.) and ion exchange reaction are the major controlling factors of groundwater chemistry. Lower molar ratios of Cl⁻/HCO₃⁻< 0.5, NO₃⁻/Cl⁻<0.3 observed reflect freshwater regime. Three samples which are in proximity to the Arabian Sea, deduce the effect of secondary contributions (saline water and anthropogenic sources). In order to determine the probable sources of groundwater contamination, principal component analysis was also carried out. The first three principal components with eigen value 1 or more are responsible for 71.31%, 12.38% and 8.32% of the total variance in the data set, indicating major role of groundwater-rock interaction and marginal saltwater intrusion effect in the study area. Groundwater quality index computed for drinking purpose indicate that about 96% of the water samples lie within the permissible limits stipulated by the World Health Organization and Bureau of Indian Standards, and fall under the good to excellent category, suggesting its suitability for drinking purpose in the area. Water quality index indicates that most of the water is of excellent to good quality for irrigation, except for a few coastal samples.

对印度马哈拉施特拉邦信德古德沿海地区北部的地下水水化学进行了研究，目的是了解其适用于家庭和灌溉用途。地下水样品从分布在研究区域66个挖井收集，2017年十一月的化学分析的结果表明月份该地下水在性质上是碱性的，并且主要特征在于钙期间⁺ -Mg ² -HCO ₃ ^-钙⁺ -Mg ⁺² -Cl ^-和Na ⁺ -Cl ^-相。钠的摩尔比⁺ /氯^- >如图1所示，两者的Mg ²⁺ /钠⁺和Ca ²⁺ /钠⁺比<1，（CA ²⁺ + Mg的²⁺）/（SO ₄ ²⁺ HCO ₃ ^-）= 1表明，硅酸盐的岩石-水相互作用/片状岩石（石英，绿泥石，闪石，片岩等）和离子交换反应是地下水化学的主要控制因素。降低的Cl的摩尔比^- / HCO ₃ ^- <0.5，NO ₃ ^- /氯^-观察到的<0.3反映了淡水状态。靠近阿拉伯海的三个样本推论出次要作用（咸水和人为来源）的影响。为了确定可能的地下水污染源，还进行了主成分分析。特征值等于或大于1的前三个主成分在数据集中占总方差的71.31％，12.38％和8.32％，表明在研究区域中地下水与岩石的相互作用和边缘咸水入侵效应的主要作用。计算得出的用于饮用目的的地下水质量指数表明，约有96％的水样在世界卫生组织和印度标准局规定的允许范围内，属于良好至优秀类别，说明其适合该地区的饮用目的。水质指数表明，除少数沿海样本外，大多数水的灌溉质量优良至良好。