Does vinegar kill germs?

Not well enough to count on, and not well enough to call it a disinfectant. The study most often quoted on the question, Rutala and colleagues in 2000, tested vinegar against four disease-causing bacteria and found it removed less than 3 log10 (less than 99.9 percent) of Staphylococcus aureus and E. coli, while the commercial disinfectants it was compared with removed 5.6 to more than 8 log10 [1]. Those results came from a test tube rather than a kitchen counter. EPA does not review vinegar's germ-killing ability at all [2]. Here is what the study found, what it did not test, and what vinegar is good for instead.

What the 2000 study tested

William Rutala and colleagues published Antimicrobial activity of home disinfectants and natural products against potential human pathogens in Infection Control and Hospital Epidemiology in 2000 [1]. Their aim was "to assess the efficacy of both natural products (vinegar, baking soda)" against household disinfectants [1].

• Products: vinegar and baking soda, against commercial products including Clorox, Lysol Disinfectant Spray, Lysol Antibacterial Kitchen Cleaner, Mr. Clean Ultra, ethanol and two hospital disinfectants (Vesphene IIse and TBQ) [1]. A later review by Canada's National Collaborating Centre for Environmental Health reports the vinegar as 5 percent acetic acid and the baking soda as 8 percent [3].
• Organisms: Staphylococcus aureus, Salmonella choleraesuis, E. coli O157:H7 and Pseudomonas aeruginosa. Selected products were also tested against poliovirus and against antibiotic-resistant and susceptible bacteria [1].
• Method: "A quantitative suspension test," with exposure times of 30 seconds and 5 minutes [1]. In a suspension test, the germs are mixed into the liquid product in a tube and then counted.

What it found

The National Collaborating Centre's review, citing the same paper, gives the vinegar figure against S. aureus more precisely: 5 percent acetic acid for 5 minutes reduced it by only 0.3 to 2.3 log10 [3]. The authors concluded that the natural products were less effective than the commercial household disinfectants [1].

The abstract does not report vinegar's results against Salmonella or Pseudomonas, and the full results table was not available to check for this page. So this page states no figure for those two. If you see one quoted, ask where it came from.

Reading a log reduction

Germ counts in these tests are reported on a log scale. Each log10 is a factor of ten:

So "less than 3 log10" means vinegar left more than 1,000 of every million S. aureus alive, and at 0.3 log10 it removed only about half. The disinfectants in the same test left 10 or fewer. How EPA uses these numbers in its own testing is on what efficacy testing means.

What the study did not show

The study answers a narrow question, and three limits matter for your kitchen.

• It was a suspension test, not a surface test. The review that summarizes it notes that efficacy in suspension tests is "drastically different" from efficacy on surfaces, and that studies use "no standardized experimental parameters," which makes them hard to compare [3]. On a real counter, germs are dried on and sometimes protected by film.
• Dirt makes acids weaker. The same review says vinegar's efficacy is "drastically reduced in the presence of organic matter" [3]. A counter with traces of raw chicken is exactly that.
• It did not test vinegar against viruses. Poliovirus was tested only with selected products [1]. Nothing in the abstract supports a claim that vinegar kills viruses.

A fair reading: in a tube, with clean conditions, 5 percent vinegar had some effect on some bacteria and fell well short of a disinfectant on others. That is all the study found.

What other sources say, and how this page treats them

New Mexico State University Extension's Green Alternatives to Toxic Household Products (G-313, revised February 2019) tells readers to "use heated vinegar or hydrogen peroxide (3%) to sanitize," with a room-temperature version that "must sit for 10 minutes" [4]. The publication cites no study or test data for that instruction [4]. This page reports it as NMSU's statement and does not follow it. A sanitizing claim needs evidence of the kind EPA reviews, and none is given.

Lifestyle sites go further and say vinegar kills bacteria, viruses and mold. They cite nothing. The study above does not support that sentence.

Why vinegar is not registered as a disinfectant

A product that claims to sanitize or disinfect is a pesticide under federal law and needs EPA registration, which requires efficacy data reviewed by EPA [5]. The vinegar in your pantry or the cleaning vinegar next to it is sold as vinegar, with no registration and no tested contact time. EPA says it "does not review effectiveness of common household ingredients like vinegar or rubbing alcohol," so it "cannot verify how well they work" [2].

The same rule binds anyone selling a vinegar cleaner. Calling it antibacterial or a disinfectant is a pesticidal claim [5]. Minimum risk products under FIFRA 25(b) may not claim to control any microorganism, so 25(b) does not cover germ claims either [6]. See what makes a cleaning product a pesticide.

What vinegar does well

Vinegar is an acid, and acids dissolve mineral deposits. That makes it good at hard-water film on glass and fixtures, soap scum and limescale, as long as the surface tolerates acid; which ones do not is on which cleaners are safe on granite, wood, grout and stainless steel?. What strength to buy, what it cleans and what it damages are on vinegar, and published vinegar recipes start with all-purpose cleaner.

Two warnings travel with it. Never combine vinegar with bleach, which releases chlorine gas; see bleach and vinegar. And do not mix it with hydrogen peroxide in a bottle to make a stronger spray; see hydrogen peroxide and vinegar.

When you do need to kill germs

If someone in the house is sick or raw meat has been on the counter, clean with vinegar or soap if you like, then use a product that is tested for the job. The simplest is regular bleach diluted as CDC directs, on making a bleach disinfecting solution.

References

1. Rutala WA, Barbee SL, Aguiar NC, Sobsey MD, Weber DJ, Antimicrobial activity of home disinfectants and natural products against potential human pathogens, Infection Control and Hospital Epidemiology 2000;21(1):33-38, doi:10.1086/501694. https://www.cambridge.org/core/services/aop-cambridge-core/content/view/6D70C6F5E3928DDB3365FB9AF7CCD8E9/S0195941700071782a.pdf/antimicrobial_activity_of_home_disinfectants_and_natural_products_against_potential_human_pathogens.pdf
2. U.S. EPA, Can I use common household substances to kill the novel coronavirus?, last updated July 28, 2026. https://www.epa.gov/coronavirus-and-disinfectants/can-i-use-common-household-substances-kill-novel-coronavirus
3. National Collaborating Centre for Environmental Health (Fong D, Gaulin C, Lê M-L, Shum M), Effectiveness of Alternative Antimicrobial Agents for Disinfection of Hard Surfaces, revised August 2014. https://ncceh.ca/sites/default/files/Alternative_Antimicrobial_Agents_Aug_2014.pdf
4. New Mexico State University Cooperative Extension, Green Alternatives to Toxic Household Products (Guide G-313), revised by Rick Griffiths and Sonja Koukel, February 2019. https://pubs.nmsu.edu/_g/G313/index.html
5. U.S. EPA, Determining If a Cleaning Product Is a Pesticide Under FIFRA, last updated July 6, 2026. https://www.epa.gov/pesticide-registration/determining-if-cleaning-product-pesticide-under-fifra
6. U.S. EPA, Conditions for Minimum Risk Pesticides, last updated August 31, 2026. https://www.epa.gov/node/64449