In an emergency flammable liquid fire situation, reliance on safety personnel, local police and fire departments, and foam performance are required for a successful fire knockdown. Training is commonplace for safety officials but foam testing is overlooked in many fire departments across the country. As specified by NFPA 11: Standard for Low-, Medium-, and High Expansion Foam, fire-fighting foam should be tested at least annually by the foam manufacturer or an independent laboratory. Poor performance of fire-fighting foam may be caused by water dilution, tank corrosion or failure to follow the manufacturer’s tank and sample requirements. For these reasons, it is recommended that safety personnel fully understand the basics of fire-fighting foam and that foam testing should be conducted at least annually, to ensure the best performance when it is needed most.