Water is essential for sanitation and efficient plumbing systems, especially in areas with unreliable supply where storage systems are widely used. However, improper design, installation, and maintenance may compromise water quality and system performance. This study aims to assess the impact of water storage systems on plumbing hygiene, water contamination, and overall efficiency. This study used descriptive-correlational research design with purposive sampling, involving 102 household respondents to assess the impact of water storage systems on plumbing hygiene and efficiency in residential areas in Cabanatuan City, Nueva Ecija. Data were collected through both physical and online survey questionnaires and analyzed using descriptive and inferential statistics to evaluate the impact of water storage systems on plumbing hygiene and efficiency. The findings revealed that water storage systems are widely utilized and generally moderately maintained, with respondents reporting occasional exposure to environmental factors and acceptable levels of plumbing hygiene and efficiency. Correlation analysis revealed that environmental risk factors showed no statistically significant relationship with plumbing hygiene and system efficiency, whereas maintenance practices demonstrated statistically significant positive relationships with water quality and system efficiency. It is concluded that water storage systems generally provide acceptable levels of plumbing hygiene and efficiency among household users in Cabanatuan City. Overall, proper maintenance remains the key factor in improving system outcomes.