How to clean a humidifier, per the EPA
Daily water changes, regular cleaning, and storage, in EPA words.
Every day
The EPA says to "Empty the tank, wipe all surfaces dry, and refill the water in portable humidifiers daily to reduce any growth of microorganisms." It says to unplug the unit first.
Every third day
The EPA says to "Clean portable humidifiers every third day." It says to unplug the unit first, remove any scale, deposits, or film from the tank and interior surfaces, and wipe all surfaces dry.
Cleaning products
The EPA says to follow the manufacturer's suggestions on cleaning products or disinfectants. If you use any cleaning or disinfecting agent, it says to rinse the tank thoroughly with several changes of tap water. If your manual gives no cleaning directions, ask the maker before you use any cleaning product.
Standing water
For console and central units, the EPA says to follow the maker's directions and, if the unit has a tank, "do not allow water to stand in the tank for extended periods of time, and keep the water clean."
End of season
The EPA says to clean the humidifier at the end of the season, make sure all parts are dry before storage, and throw away used demineralization cartridges, cassettes, or filters. It says to store the unit in a dry place and clean it again after storage.
If you feel unwell
The EPA says to stop using your humidifier and contact your physician if you have breathing symptoms you believe are linked to using it, even if you follow the care steps. We are not a health site.
Recalls
Search cpsc.gov/Recalls for your model before you use a secondhand unit.
This is general information, not medical or purchasing advice.
Sources: EPA, Use and Care of Home Humidifiers; CPSC, Recalls and Product Safety Warnings.
FAQ
Next: white dust and water
Tap water, distilled water, white dust.
