Representative execution is basic for a firm to support its monetary reasonability in the present business climate. Each association's prosperity is to a not set in stone by the efficiency of its representatives. Subsequently, expanding representative efficiency has arisen as a basic issue for the achievement and supportability of endeavors. The objectives of this study were: to determine the influence of evaluation to assess the influence of management by objective to establish the influence of performance appraisal and to evaluate the influence of 360 degree appraisal on employee performance at Eldoret Water and Sanitation Company. This study would be significant to the management of Eldoret Water and Sanitation Company as it will aid them in decision making and policy formulation, further, the findings also would be beneficial to both current and future researchers as it will act as reference point and literature review. The study was guided by goal setting, management by objective and expectancy theories. This study's target population was 405 workers. The sample size of the study was 121 workers who were picked by the use of random sampling technique. The gathered data was analyzed using descriptive statistics of mean, standard deviation, and percentages as well as inferential statistics which included multiple linear regression. Tables were used to present the analyzed data. The study found that evaluation methods had significant positive relationship with employee performance, as indicated by a coefficient of .474, similarly, management by objective was found to have a positive impact on employee performance, with a coefficient of .401. The study concluded that evaluation methods had positive perception among respondents towards performance evaluation. Lastly, the study recommended that ELDOWAS should continue in utilizing performance evaluation as a valuable tool for identifying areas of improvement and setting clear performance expectations.