FEMA Caseworker Accountability Act This bill directs the Government Accountability Office (GAO) to report to Congress on case management personnel turnover at the Federal Emergency Management Agency (FEMA). Specifically, the GAO must report on the turnover rate for FEMA case management personnel, the average and median length of employment for such personnel, the steps that FEMA is taking or plans to take to lower the turnover rate, the number of FEMA personnel detailed to work disaster recovery, and personnel rotations.