Concrete and masonry dams subjected to prolonged seepage undergo progressive physicochemical deterioration through calcium leaching, wherein calcium hydroxide (Ca(OH)₂) dissolvesand migrates with seepage water, compromising cement paste integrity. This study investigates cementitious material collected from seepage-affected drainage galleries of two major Maharashtra dams—Upper Wardha Dam (Amravati) and Hatnur Dam (Jalgaon)—through systematic chemical analysis per IS 4032:1985. Seven parametersw