This study investigates the microbiological and physical quality of deep well water sources in a Barangay in Cauayan City, Isabela, alongside community perceptions and practices related to water safety. Utilizing a quasi-experimental approach, the study assesses the effectiveness of a community-based water safety intervention designed to enhance water handling, sanitation, and awareness among residents. A total of 50 purposively selected adult household members participated in surveys, household observations, and water quality testing of eleven deep wells. The results revealed a concerning disparity in water potability, with only five wells meeting the standards set by the World Health Organization (WHO) and the Department of Health (DOH), which stipulate that safe drinking water must have no detectable E. coli and Total Coliforms levels below 1.1 MPN/100ml. Four wells demonstrated microbiological contamination, with elevated levels of coliform bacteria and E. coli, indicating fecal contamination and potential health hazards if consumed untreated. The demographic data indicated a community with moderate educational levels and low income, factors that may influence water safety behaviors. These findings highlight the critical need for community-driven sanitation and water treatment interventions to achieve compliance with WHO and DOH standards, ensuring access to safe and potable water. The study underscores the importance of integrating community education and behavioral change strategies to promote sustainable improvements in water quality and public health.