In this study, groundwater quality monitoring and evaluation of Greater Guwahati is presented based on the physico-chemical characteristics of thirty samples collected on grid pattern. The various parameters analyzed include pH, electrical conductivity, temperature, Dissolved Oxygen (DO), Total Dissolved Solids (TDS), alkalinity, hardness, Na⁺, K⁺, CA⁺⁺, Mg⁺⁺, NO₃^-, SO4^--, Cl^- and F^-. The results were compared with water quality standards prescribed by BIS and WHO.

Various parameters like Kellye’s ratio, Sodium Absorption Ratio (SAR), Residual Sodium Carbonate (RSC), Magnesium hazards, percentage of sodium and Permeability Index was determined to evaluate the suitability of groundwater for irrigation purposes.

An attempt has been made to classify the quality of groundwater on the basis of Stiff Pattern Diagram, Piper Trilinear Diagram, US Salinity Laboratory Classification, Gibbs Variation Classification, Durove Trinlinear Classification, Donnen’s Classification and Wilcox Classification.

The suitability of water for drinking and irrigation purposes has been tested with reference to available standards on the basis of chemical parameters. The present report indicates that water quality of Greater Guwahati is generally safe so far as the physico-chemical parameters are concerned barring the presence of excess iron.

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