Can You Mix Hydrogen Peroxide and Vinegar? It Makes Peracetic Acid
Short answer: don’t mix them. The New Jersey Department of Health warns about hydrogen peroxide and vinegar: “Together they form peracetic acid, which can irritate the eyes, skin, and lungs” (NJDOH hazard alert).
What peracetic acid is
Peracetic acid (also called peroxyacetic acid) is a real industrial sanitizer, and that is why mixing your own is a bad idea: in commercial products it is sold at a controlled strength with strict handling directions. One EPA-registered peroxyacetic-acid sanitizer, which also contains hydrogen peroxide, carries the label warning “DANGER. CORROSIVE. Causes irreversible eye damage and skin burns. Harmful if swallowed. May be fatal if inhaled”, requires goggles or a face shield, rubber gloves and protective clothing, and says to mix it “only with potable water” (EPA Reg. No. 66171-103 label).
Its airborne exposure limit is low: OSHA’s chemical database lists an ACGIH short-term exposure limit of 0.4 ppm for peracetic acid (OSHA Occupational Chemical Database). A mix made in a spray bottle has no known strength and none of those controls.
Using them safely
- Keep them in separate, labelled containers. Never pour one into the other’s bottle.
- Use each on its own, the way its label directs, and don’t combine them in a bucket or on a surface to “boost” cleaning.
- If you need a sanitizer of this type at work, buy a registered product and follow its label, including the PPE it requires, rather than mixing one.
Label any bottle you decant into — see secondary container labeling. For hydrogen peroxide compared with bleach as a disinfectant, see hydrogen peroxide vs bleach. Washington’s health department also warns that bleach reacts with hydrogen peroxide (WA DOH), so don’t combine those two either.
Other combinations never to mix
The full list, including bleach with ammonia, vinegar, rubbing alcohol and drain cleaner: Cleaning Products You Should Never Mix.
If a mix has already happened
- Leave the area and take others with you.
- Ventilate without going back in — open a door or window from the doorway if you can.
- Get help for anyone with symptoms. Poison Control in the United States is 1-800-222-1222; call emergency services if someone is struggling to breathe.
Frequently asked questions
What happens when you mix hydrogen peroxide and vinegar?
They form peracetic acid. The New Jersey Department of Health warns it can irritate the eyes, skin and lungs, and says not to mix them.
Is peracetic acid dangerous?
In concentrated commercial sanitizers it is labelled corrosive: one EPA-registered peroxyacetic acid product's label says it causes irreversible eye damage and skin burns and may be fatal if inhaled. OSHA's chemical database lists a short-term exposure limit of 0.4 ppm.
Can you use hydrogen peroxide and vinegar one after the other?
Use each on its own as its label directs and keep them in separate, labelled containers. Combining them, in a bottle or on a surface, forms peracetic acid.
This guide quotes the cited public-health sources for general information and is not medical or legal advice.
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