This study examines water treatment facility yield improvement in South Africa, focusing on technological and methodological advancements to enhance operational efficiency. Panel data analysis was employed to estimate the impact of various parameters on yield improvement in South African water treatment facilities. The study utilizes econometric models to account for temporal and spatial variations. The panel data revealed a significant positive correlation (p < 0.05) between investment in infrastructure upgrades and yield improvements, suggesting that substantial investments can lead to an increase of over 15% in treatment efficiency. This study validates the effectiveness of panel data estimation methods for evaluating yield improvement in water treatment facilities, providing robust evidence for policymakers and practitioners. Policymakers should prioritise investment in infrastructure upgrades as a key strategy to enhance water treatment facility yields. Future research could explore additional factors influencing yield improvements. The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.