The objective of this study is to determine the influence of responsibility and work environment on employee performance, with work motivation serving as an in-tervening variable, at Perumda Air Minum Kota Padang. The study utilized a sample of 80 respondents. Data collection was conducted via questionnaires that had undergone validity and reliability testing. Employee performance is a key determinant of organizational success; therefore, it requires support from a strong sense of respon-sibility, a favorable work environment, and robust work motivation. This study employs a quantitative approach using a survey method. Data analysis was performed using Partial Least Squares Structural Equation Modeling (PLS-SEM) with SmartPLS 3.0 software to assess both direct and indirect effects among the variables. The results indicate that responsibility has a positive and significant effect on work motivation, and the work environment also has a positive and significant effect on work motivation. Furthermore, responsibility has a positive and significant effect on employee performance, whereas the work environment has a positive but insignificant effect on employee performance; work motivation, meanwhile, has a positive and significant effect on employee performance. Additionally, work motivation significantly mediates the effect of responsibility on employee performance, but it does not yet demonstrate a significant mediating role in the relationship between the work environment and employee performance.