Grease Fires: Why Water Makes Them Worse (And What To Do Instead)

Why water is the worst thing you can pour on a grease fire

Cooking oil is lighter than water and does not mix with it. When water hits burning grease, it sinks below the oil, hits the pan's surface, and instantly flashes to steam. That steam expansion is violent, and it launches burning droplets of oil outward in every direction. What was a contained fire in a pan becomes a spray of flame across the stove, the counter, cabinets, and anyone standing nearby. This is the single most common way a small kitchen fire turns into a serious injury or a house fire that spreads well beyond the stove.

What to do instead, in order

First, if you can do it safely, turn off the burner. Do not reach over the flame; turn it off from the side or behind if possible. Second, cover the pan with a metal lid or a cookie sheet to cut off its oxygen supply. Fire needs oxygen to keep burning, and smothering it is the fastest way to stop it cold. Slide the lid on rather than dropping it from above, and leave it in place until the pan is completely cool, which can take longer than it looks. Do not lift the lid to check on it, since that lets oxygen back in and can reignite the fire.

If a lid is not within reach

Baking soda smothers a small grease fire the same way a lid does, by cutting off oxygen. Flour does not work and can actually make the fire worse, since flour is combustible in fine, airborne form. A Class B or Class K fire extinguisher, if you have one mounted in the kitchen, is built for exactly this situation. If the fire is already spreading beyond the pan, growing quickly, or producing heavy smoke, stop trying to handle it yourself: get everyone out, close the door behind you to slow the spread, and call 911 from outside.

After the fire is out

Even a contained grease fire leaves a mess that goes deeper than the visible scorch marks. Smoke and grease residue travel through the kitchen on airborne soot, settling into cabinet finishes, range hood filters, and anywhere air moved during the fire. That residue is acidic and will keep discoloring surfaces and corroding metal if it is not cleaned properly. If the fire scorched cabinets, damaged countertops, or left smoke odor that will not air out, that is a sign the damage goes beyond a wipe-down. You can read more about what a professional cleanup and rebuild process looks like on our fire damage restoration page, or see how reconstruction works if cabinets or structure need to be replaced.

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