Water utility master planning is the methodical evaluation of existing system conditions and projected future demands to strategically guide infrastructure investments and operational decisions. An effective master plan not only prioritizes capital improvement expenditures but also provides a defensible, adaptable framework for utility managers navigating growth, regulatory requirements, and operational uncertainty. This presentation examines the development and implementation of a water system master plan for a local utility, with a focus on balancing flexibility and enforceability. Attendees will gain insight into how a master plan can deliver actionable near-term recommendations while maintaining long-range guidance that remains resilient under changing conditions and aligned with strategic objectives. Warren County Water District initiated its water system master planning effort in 2025 using an InfoWater Pro hydraulic model. The District serves approximately 35,000 customers across a service area that includes both urban and rural development patterns, supported by more than 1,100 miles of water main, 24 storage tanks, and 34 pressure zones. The master planning approach centered on a zone-by-zone evaluation of projected water demands, comparing existing infrastructure to anticipated conditions at full build-out and at defined planning horizons. Future demands were developed by integrating planning commission GIS data, local institutional knowledge, and historical growth trends, and were subsequently applied within the hydraulic model to evaluate system performance. Model results were used to identify the timing, sizing, and location of recommended improvements. This pressure-zone-based planning framework enabled a more defensible assessment of development impacts and capital needs, while supporting informed decision-making to maintain levels of service over the planning period.