The purpose of this study was to investigate the impact of WASH interventions on students' school performance in Addis Ababa Yeka sub-city primary and secondary government schools. The study used a descriptive and explanatory research design, as well as primary and secondary data sources. A multistage sampling procedure was used to select twelve schools purposively and draw a sample of 279 students at random. The questioner was distributed, and 221 relevant data points were collected, as well as 12 key informant interviews. Propensity score matching was used to analyze quantitative data in this study using STATA 14, and inductive analysis was used to analyze qualitative data. According to the study's findings, only a some of WASH intervention packages significantly improved students' school performance as measured by rank and absenteeism. The findings revealed that providing safe water and hygiene intervention at school has no effect on students' grades. On the other hand, having proper sanitation at school has a significant impact on student rank. In terms of student absenteeism, statistical analysis shows that having safe drinking water at school helps to improve student school performance by lowering student absenteeism. In contrast, access to proper sanitation and hygiene facilities at school has no statistically discernible impact on student absenteeism. As a result, this study concludes that while not all WASH intervention packages have an impact on student school performance, some of them can reduce absenteeism and improve student rank. The study recommended that, the school community should take more ownership and accountability for the proper operation and proactive maintenance of WASH facilities. To bring accountability, the government should also have a policy that includes School WASH in education and the MoE's training policy. In addition, the government should have clear and agreed-upon indicators at all levels. This study also suggests that WASH actors conduct research before embarking on any project.