Characterization and Mapping of Underground Water Quality in Dadri-II Block of Charkhi Dadri District in Haryana

Abstract— A study was conducted to characterize the groundwater quality in the Dadri-II block of Charkhi Dadri district, Haryana. A total of 122 groundwater samples were collected from Dadri-II and analyzed for key parameters. Based on Electrical Conductivity (EC), Sodium Adsorption Ratio (SAR), and Residual Sodium Carbonate (RSC), the water samples were classified: 18.85% as good, 28.68% as marginally saline, 50.81% as high SAR-saline, and 1.6% as highly alkali. Electrical conductivity ranged from 0.26 to 13.95 dS m⁻¹, SAR from 1.42 to 36.39 (mmol L⁻¹)¹/², and RSC from nil to 5.40 me L⁻¹. Sodium was the dominant cation (1.10 to 98.70 me L⁻¹), and chloride was the dominant anion (1.20 to 101.20 me L⁻¹), followed by sulfate, bicarbonate, and carbonate. The spatial variability of these parameters was mapped, confirming that high SAR-saline water is the most widespread quality issue in the block, which has significant implications for irrigation management.