<p>Assessment of groundwater quality is essential for its long-term and safe use in drinking supplies, agriculture, and industrial purposes. Therefore, this review paper focuses on a comprehensive assessment of the hydrochemistry and groundwater quality in Bihar, India. The study uses various techniques to interpret the comprehensive hydrochemical condition of groundwater, building on previous research. The study also examines various aspects of groundwater quality by evaluating its physical and chemical characteristics to estimate the status of groundwater quality. Key indicators, including the Water Quality Index (WQI), Sodium Absorption Ratio (SAR), Percentage Sodium (%Na), Potential Salinity (PS), Magnesium Ratio (MR), Kelly Ratio (KR), and diagram-based assessments, were examined to provide a comprehensive understanding of groundwater suitability. Through this integrative approach, the review not only highlights the prevailing groundwater issues in Bihar but also offers valuable insights that can guide the development of effective water management policies. Furthermore, it serves as a vital resource for researchers, policymakers, and administrators dedicated to the sustainable management and protection of groundwater resources in the state.</p>