SERDP and ESTCP co-sponsored a workshop to (1) to review the current state of the science regarding sources of PFAS contamination, particularly AFFF, (2) to evaluate currently available and developing technologies for characterization and remediation of AFFF sites, and (3) to identify research and demonstration needs to improve remediation performance, efficiency, and ultimately reduce the cost of managing AFFF sites. Approximately 65 invited personnel representing DoD Remedial Project Managers, federal and state regulators, engineers, researchers, industry representatives, and consultants were in attendance. Results are detailed in the Workshop Report, which will guide the SERDP and ESTCP strategic plan for investments in the area of PFAS contamination over the next five years.