OBJECTIVE: The aim of this study was to investigate participation and effectiveness of a multiyear comprehensive workplace health promotion (WHP) program. METHODS: Participation and effectiveness data came from employer and vendor systems. Health data came from health risk assessments (HRA) and biometric screenings. Participation and effectiveness were analyzed using descriptive analyses, t tests, and Mann-Whitney U tests where appropriate. Overall impact was assessed using the PIPE Impact Metric. RESULTS: Eighty-six percent of employees completed the HRA and 80% the biometrical screenings. Annual participation rate was 24%, and total reach was 58%. The portion of successful participants was 23% in 2010 to 2013 and 18% in 2014 to 2017. PIPE Impact scores were 18% for 2010 to 2013 and 14% for the 2014 to 2017 study periods. CONCLUSION: Despite modest annual participation rates, overall 8-year reach was considered reasonable. Conservatively, we consider the overall program impact to be moderate.