The assessment of groundwater quality is made through the estimation of Ca2+, Mg2+, Na+, K+, CO3 2–, HCO3 –, Cl–, SO42–, EC, TDS,TH and pH in Naguleru Sub-Basin area Guntur District, Andhra Pradesh, India. Based on these analyses, parameters like sodium adsorption ratio, sodium percentage, residual sodium carbonate and magnesium hazard were calculated. Sodium adsorption ratio is shown 62% of groundwater is belongs to C3 S1, indicating high salinity and low alkali water and based on the Na% with 49% for groundwater falls in good to permissible category. Residual sodium carbonate values suggesting safe to marginally suitable category for irrigation purposes. The quality of water in the study area is high for all constituents ruling out pollution from extraneous source.
