Rwanda's municipal water systems are crucial for public health and economic development. A systematic review encompassing methodologies used in previous studies examining adoption rates of municipal water systems in Rwanda. The review considered quantitative and qualitative methods. One randomized field trial found a 50% adoption rate for new water system technologies among participating communities, with robust standard errors indicating reliability. Methodological approaches vary widely but randomized trials offer a reliable method to measure adoption rates in municipal water systems. Future studies should consider longitudinal designs and incorporate community feedback mechanisms to improve adoptability of new water technology solutions. The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.