The growing gap between water supply and demand has become one of the most significant challenges facing Egypt today. As a result, intensive efforts are being undertaken to address this critical issue. The Nile River represents Egypt’s primary water resource, supplying approximately 97% of the country’s freshwater needs. Consequently, any changes in the hydrology of the Blue Nile Basin directly affect Egypt’s natural water inflow, particularly since the Blue Nile is the largest contributor to the Nile’s total discharge. In this context, Egypt’s concerns have increased regarding the construction of the Grand Ethiopian Renaissance Dam (GERD) and its filling stages. This study aims to evaluate Egypt’s current water budget over the period (2010–2026) and to investigate the impact of GERD filling stages on this budget. The research is based on geostatistical data collected on Egypt’s water resources during the study period, using annual reports issued by the Ministry of Water Resources and Irrigation and the Central Agency for Public Mobilization and Statistics. The results indicate that the dam’s filling stages have had negative impacts on Egypt’s water budget, particularly evident during 2023 and 2024, where a noticeable decrease in water availability was observed. Accordingly, the study recommends enhancing water reuse through appropriate technologies, improving water distribution efficiency, upgrading water conveyance systems, and minimizing losses through measures such as lining irrigation and drainage canals. Additionally, the use of evaporative condensation techniques is suggested to recover water, along with increasing groundwater abstraction while carefully considering sustainability and environmental precautions.