Periodical variations in the irrigation well water quality studied for 25 wells from Dapoli and 25 wells from Murud of coastal Konkan (M.S.) in first week of December (2016), March (2017) and June (2017). All rabi and rabi hot weather crops are irrigated with the water from these wells during this period. Dapoli is at a higher altitude (800 ft) whereas Murud is at the sea level. These two locations are 7 km apart from each other. Then also there is difference in the quality of ground water from both locations. The properties viz. pH, EC, cations (Ca²⁺, Mg²⁺, Na⁺ and K⁺), anions (HCO₃^-, CO₃^2-, Cl^- and SO₄^2-), boron, sodium adsorption ratio (SAR) and residual sodium carbonate (RSC) were estimated and their respective water quality classes were decided. The result obtained from investigation revealed that the well water samples from Dapoli were within the safe limit throughout the irrigated cropping season. As far as salinity hazard, RSC class and chloride content are concerned most of the irrigation well water samples from Murud were under moderately safe limit from March. The relative cation contents in well water samples of Murud and Dapoli were Na⁺ > Ca²⁺ > Mg²⁺ > K⁺ and Ca²⁺ > Na⁺ > Mg²⁺ > K⁺, respectively. That of anion from Murud and Dapoli were Cl^- > HCO₃^- > SO₄^2- > CO₃^2- and HCO₃^- > Cl^- > SO₄^2- > CO₃², respectively. There was no sodicity hazard in water samples Murud. The pH, EC, Cations, Anions, Boron, SAR and RSC values of irrigation water collected in the first week of June were higher as compared to those during first week of December and March might be due to evaporation and temperature was high during first week of June lead to decreased dilution of water.

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