Chlorine bleach is the most reliable and widely recommended cleaner for killing norovirus on hard surfaces. The CDC recommends using a bleach solution with at least 1,000 parts per million (ppm) of sodium hypochlorite, which translates to roughly 5 tablespoons of standard household bleach per gallon of water. But bleach isn’t your only option, and it doesn’t work on every surface. The right cleaner depends on what you’re disinfecting.
Why Norovirus Is So Hard to Kill
Most household cleaners are designed to destroy bacteria or enveloped viruses like the flu. Norovirus is neither. It’s a non-enveloped virus, meaning it lacks the fatty outer layer that soap, alcohol, and many disinfectants are built to dissolve. Instead, norovirus is wrapped in a tough protein shell just 27 nanometers across. That shell stays stable across a wide pH range (3 to 7) and withstands temperatures up to nearly 140°F. In one volunteer study, norovirus treated with up to 10 mg/L of chlorine still caused gastroenteritis symptoms in participants.
This durability is why you can’t simply wipe down a counter with an all-purpose spray and assume you’ve eliminated the virus. It takes specific chemicals at specific concentrations, left on the surface for a specific amount of time.
Bleach: The Gold Standard
A chlorine bleach solution is the cheapest and most effective option for hard, non-porous surfaces like countertops, bathroom fixtures, and tile floors. Mix 5 tablespoons (about one-third cup) of regular unscented household bleach into one gallon of water. This produces a solution in the 1,000 to 5,000 ppm range, which is what public health agencies recommend for norovirus decontamination.
The solution needs to stay visibly wet on the surface for the full contact time listed on the product label, typically 10 minutes. Simply spraying and wiping immediately won’t do the job. For areas with visible vomit or stool contamination, clean up the material first with paper towels, then apply the bleach solution and let it sit.
Bleach does have drawbacks. At concentrations above 500 ppm, it corrodes metals, discolors fabrics, and can damage natural stone surfaces like granite or marble. It also releases toxic chlorine gas if mixed with ammonia or acidic cleaners, so never combine it with other household products.
EPA-Registered Alternatives
The EPA maintains a specific list of products tested and proven effective against norovirus, called List G. These products have undergone laboratory testing using feline calicivirus, the accepted surrogate for human norovirus. The active ingredients that appear on this list include hydrogen peroxide, peroxyacetic acid (peracetic acid), hypochlorous acid, and certain quaternary ammonium compounds.
You can search the EPA’s List G online by product name or registration number. When buying a disinfectant, look for the EPA registration number on the label and confirm that the product’s directions specifically include use against norovirus. Not every “antibacterial” or “disinfectant” product qualifies. The contact time varies by product and concentration, so always follow the label instructions.
Hydrogen Peroxide Products
Accelerated hydrogen peroxide (AHP) products are a popular bleach alternative because they’re less corrosive and don’t produce harsh fumes. However, concentration matters enormously. Lab testing found that feline calicivirus (the less resistant norovirus surrogate) was inactivated at 3,500 ppm of AHP after 10 minutes, while murine norovirus (a more resistant surrogate) required 35,000 ppm. Standard 3% hydrogen peroxide from the drugstore is 30,000 ppm, so it may be sufficient at full strength with adequate contact time, but diluted formulas likely fall short. Your safest bet is to use a commercial AHP product that’s on the EPA’s List G.
What Doesn’t Work
Alcohol and Hand Sanitizer
Standard alcohol-based hand sanitizers are largely ineffective against norovirus. In lab testing, 60% ethanol (the active ingredient in most sanitizers) produced less than a one-log reduction in norovirus copies regardless of whether contact lasted 30 or 60 seconds. That means the sanitizer eliminated less than 90% of the virus. Isopropanol-based sanitizers performed even worse, showing essentially no inactivation. After ethanol treatment, the virus still replicated in all six test samples. Hand sanitizer is fine as a supplement, but soap and water is the only reliable hand hygiene method against norovirus.
Vinegar and Natural Cleaners
Vinegar is not a practical disinfectant for norovirus. In a study testing 5%, 10%, and 15% vinegar solutions against a norovirus surrogate, it took 3 to 5 days of continuous exposure at refrigerator temperatures just to achieve a one-log (90%) reduction. For context, effective disinfection typically requires at least a three-log reduction (99.9%). There is no evidence that citric acid, essential oils, or other “natural” cleaning agents inactivate norovirus in any practical timeframe.
Cleaning Soft Surfaces and Laundry
Bleach and chemical disinfectants can’t be used on most fabrics, carpets, or upholstered furniture without causing damage. For contaminated clothing and linens, the CDC recommends washing with detergent and hot water at the maximum cycle length, then machine drying at the highest heat setting. OSHA specifies a drying temperature above 170°F. Handle contaminated items carefully, wearing gloves, and wash them separately from other laundry. If an item can tolerate bleach (white cotton towels, for instance), adding bleach to the wash cycle provides extra assurance.
Steam Cleaning for Carpets
Steam is surprisingly effective on soft surfaces where chemical disinfectants struggle. In lab testing on nylon carpet, steam treatment for just 15 seconds achieved a greater than 99.999% reduction of feline calicivirus and a greater than 99.9% reduction of a second norovirus surrogate, Tulane virus. These results held across different carpet backing types and improved slightly with longer contact times of 30 to 60 seconds. If someone has vomited on carpet, first remove the solid material, then go over the area thoroughly with a steam cleaner. Consumer-grade steam cleaners that produce actual steam (not just hot water extraction) can reach sufficient temperatures.
Practical Cleanup Steps
Knowing which chemical works is only half the equation. How you clean matters just as much. Norovirus particles can become airborne during vomiting and settle on surfaces several feet away, so decontamination should extend beyond the visible mess.
- Wear gloves and a mask while cleaning up vomit or stool. Norovirus is extremely contagious, with as few as 18 viral particles capable of causing infection.
- Remove visible contamination first using disposable paper towels or rags. Bag and discard them immediately. Organic matter (vomit, stool) inactivates bleach on contact, so the surface needs to be relatively clean before disinfecting.
- Apply your disinfectant generously and keep the surface wet for the full contact time. For a bleach solution, that means at least 10 minutes.
- Disinfect a wide radius around the contamination site. Wipe down nearby light switches, door handles, faucet knobs, and toilet flush levers.
- Wash your hands with soap and water for at least 20 seconds after removing your gloves. Do not rely on hand sanitizer.
For high-touch surfaces in a household where someone is actively sick, repeat disinfection at least once or twice daily until 48 hours after symptoms resolve. Norovirus can persist on hard surfaces for days or even weeks in the right conditions, so a single cleaning isn’t enough to prevent spread.