In this study, the quality of groundwater was assessed in a semi-arid region of India by using an entropy weighted water quality index (EWQI) and a pollution index of groundwater (PIG). The EWQI and PIG methods were used to evaluate data on physicochemical parameters in relation to drinking water quality standards. Groundwater samples were collected from the Dubbak region, Telangana state, India, and were analyzed for pH, total hardness, electrical conductivity, total dissolved solids, bicarbonate (HCO₃⁻), chloride (Cl⁻), sulfate (SO₄²⁻), nitrate (NO₃⁻), fluoride (F⁻), calcium (Ca²⁺), magnesium (Mg²⁺), sodium (Na⁺), and potassium (K⁺). The groundwater of the study region is alkaline in nature. The abundance of cations and anions based on their mean values is in the following order: Na⁺ > Ca²⁺ > Mg²⁺ > K⁺ and Cl⁻ > HCO₃⁻ > NO₃⁻ > SO₄²⁻ > F⁻, respectively. The calculated EWQI values ranged from 49.0 to 174.6, with an average of 93.3. Overall, EWQI data showed that only 60% of groundwater samples were of suitable quality for drinking, although only marginally, whereas the remaining 40% of samples were unsuitable for drinking purposes and would therefore require treatment. The values of PIG varied from 0.5 to 1.8, with an average of 1.0, which showed that only 63% of groundwater samples from the study area were suitable for drinking purposes.

在这项研究中，通过使用熵权加权水质指数（EWQI）和地下水污染指数（PIG）对印度半干旱地区的地下水质量进行了评估。EWQI和PIG方法用于评估与饮用水水质标准相关的理化参数数据。从Dubbak区域，特兰伽纳状态，印度采集的地下水样品，并进行分析的pH，总硬度，导电率，总溶解固体，碳酸氢根（HCO ₃ ^- ），氯离子（CL ^- ），硫酸根（SO ₄ ^2-）根，硝酸根（NO ₃ ^- ），氟离子（F ^- ），钙（Ca ²⁺），镁（Mg ²⁺），钠（Na⁺）和钾（K ⁺）。研究区域的地下水本质上是碱性的。阳离子和阴离子的丰度基于它们的平均值是按以下顺序：钠⁺  >的Ca ²⁺  > Mg的²⁺  >ķ ⁺和Cl ^-  > HCO ₃ ^-  > NO ₃ ^-  > SO ₄ ^2-  >˚F ^-， 分别。计算得出的EWQI值范围为49.0至174.6，平均为93.3。总体而言，EWQI数据显示，只有60％的地下水样品具有适合饮用的质量，尽管仅有少量，而其余40％的样品不适合饮用，因此需要进行处理。PIG的值在0.5到1.8之间变化，平均值为1.0，这表明研究区域中只有63％的地下水样品适合饮用。