During a hazardous materials incident, which action is the primary priority when dealing with a spill of a flammable liquid?

• A. Apply foam to the liquid
• B. Prevent ignition
• C. Dike drains
• D. Ignite fuel to burn off

Answer: (B)

Preventing ignition is the top priority because vapors from a flammable liquid can ignite from a spark, static discharge, or a hot surface, leading to a rapid fire or explosion that can quickly overwhelm responders and escalate the incident. By eliminating ignition sources—shutting off or isolating electrical equipment, grounding and bonding containers to prevent static buildup, avoiding any open flames or sparks, and restricting access—you reduce the immediate fire risk and create the safer conditions needed to address the spill. Only after ignition hazards are controlled do containment steps like limiting spread or applying suppression measures come into play. Burning off the fuel or using containment methods are important but must follow ignition control, not precede it.