This study explores the development and performance enhancement of polyethersulfone (PES) membranes through dual modification using polyvinylpyrrolidone (PVP) and magnesium hydroxide (Mg(OH)₂). The objective was to investigate the impact of these additives on membrane permeability, rejection efficiency, and antifouling properties. Membranes were fabricated via non-solvent induced phase separation (NIPS) and characterized using FTIR, SEM, water contact angle (WCA) analysis, and filtration performance tests. Results showed that the PPM membrane achieved the highest pure water permeability (90.6 L/m².h) due to improved porosity and hydrophilicity. FTIR analysis confirmed the presence of hydrophilic functional groups, while WCA measurements revealed a significant reduction in contact angle, indicating enhanced wettability. Although humic acid rejection slightly decreased to 70.5% in dual-modified membranes, the antifouling performance significantly improved, with a flux recovery ratio (FRR) of 87.2%. These findings demonstrate that the incorporation of PVP and Mg(OH)₂ into PES membranes synergistically improves water transport and fouling resistance. The study provides valuable insights for developing next-generation membranes suitable for complex water treatment applications, particularly in improving operational efficiency and durability.