How to get rid of black mold?
- Mold
Black mold is handled exactly like any other mold. EPA and CDC both say the color and species change nothing about what you do. Fix the water source first, then handle areas under about ten square feet yourself with detergent and water. Porous material that stayed wet is removed, not cleaned.
The short version
- CDC says it is not necessary to determine what type of mold you have. All molds are treated the same way.
- The water problem comes first. Mold that is cleaned but not dried out comes back in the same place.
- EPA puts the do-it-yourself line at about ten square feet — roughly a three-foot by three-foot patch.
- Hard surfaces are scrubbed with detergent and water. Absorbent materials that got wet may have to be thrown away.
- Do not paint or caulk over it. Paint applied over mold peels, and the mold is still there.
“Black mold” is a description, not a diagnosis Link to this section
The phrase usually means Stachybotrys chartarum, and it has carried a reputation since the late 1990s that the evidence never supported.
CDC’s position is direct: “To date, a possible association between acute idiopathic pulmonary hemorrhage among infants and Stachybotrys chartarum has not been proven,” and “At present, no test exists that proves an association between Stachybotrys chartarum and particular health symptoms.”
CDC also states that “it is not necessary to determine what type of mold you may have growing in your home or other building,” because all molds are treated the same way with respect to potential health risks and removal.
Plenty of dark-colored growth is not Stachybotrys at all. The most common indoor molds are Cladosporium, Penicillium and Aspergillus, and none of that changes the response.
The line EPA actually draws Link to this section
EPA sets the do-it-yourself boundary by area, not by species:
If the moldy area is less than about 10 square feet (less than roughly a 3 ft. by 3 ft. patch), in most cases, you can handle the job yourself.
Its remediation guidance for larger buildings puts numbers on what changes past that line:
| Total affected area | Protective equipment | Containment |
|---|---|---|
| Under 10 sq ft | Minimum N-95 respirator, gloves, goggles | None required |
| 10 to 100 sq ft | Limited or full, by professional judgment | Limited, by professional judgment |
| Over 100 sq ft | Full, by professional judgment | Full, by professional judgment |
That table is the honest answer to “how big is too big”. It is not a marketing threshold — it is the point at which disturbing the growth puts enough spores in the air that the person doing the work, and everyone else in the building, needs to be protected from it.
What EPA says to use, and what it says not to Link to this section
For a small area on a hard surface, EPA’s instruction is plain: scrub the mold off with detergent and water, and dry completely.
On biocides, including the bleach almost every other page recommends:
The use of a chemical or biocide that kills organisms such as mold (chlorine bleach, for example) is not recommended as a routine practice during mold cleanup.
The reasoning is worth understanding, because it reframes the whole question. Dead mold still causes allergic reactions. Killing it does not remove the protein that a sensitized person reacts to. The job is removal, and a product that kills without removing has done the smaller half of it.
On absorbent material, EPA is equally plain: absorbent or porous materials such as ceiling tiles and carpet may have to be thrown away if they become moldy, because mold can fill the spaces and crevices and be impossible to remove completely.
Why the water comes first Link to this section
EPA’s prevention statement is the most useful sentence in the entire subject:
If wet or damp materials or areas are dried 24-48 hours after a leak or spill happens, in most cases mold will not grow.
Read that as what it is — a prevention window, not a countdown clock. It is not that mold appears on the third day. It is that material dried inside that window mostly does not grow it at all.
The corollary is what makes cleaning alone fail. Mold on a surface is the visible end of a moisture problem that is still running. Remove the growth without removing the water and you have reset a clock, not fixed anything.
What this means for your claim
Mold is the one part of a property claim that is almost never paid from your dwelling limit. Most homeowners policies carry a separate fungi and mold sublimit — frequently $10,000, sometimes $5,000, occasionally nothing at all — and it applies to remediation, testing and the rebuild of whatever had to be removed.
What decides whether that sublimit even opens is usually not the mold. It is the water event underneath it. Mold that followed a sudden, covered escape of water is generally within reach of the policy, up to the cap. Mold that grew from a long-running leak, or from humidity nobody addressed, is typically treated as a maintenance condition and excluded outright.
This is why the date matters more than the square footage, and why the photographs you take before you clean anything are worth more than the cleaning.
What comes next
Mold is a symptom. If you have it, something was wet for longer than about two days, and the honest next question is what. See water categories for what the source water means, mold sublimits for what your policy will actually pay, and mold for the drying window that decides whether it comes back.
Common mistakes
- Paying for species testing before doing anything else. CDC does not recommend mold testing, and the result does not change the work.
- Cleaning the mold and leaving the moisture. It returns to the same square foot within weeks.
- Painting or caulking over it. EPA is explicit — clean and dry the surface before painting, or the paint peels and the mold stays.
- Assuming a bigger area just means more of the same job. Past about ten square feet, EPA's own guidance changes to containment and professional judgment.
- Throwing away the moldy material before photographing it, which removes the evidence the claim depends on.
Common follow-up questions
Is black mold more dangerous than other mold?
There is no evidence that it is. CDC states that no test exists proving an association between Stachybotrys chartarum and particular health symptoms, and that the retracted infant pulmonary hemorrhage link has never been proven. All molds are treated the same way for removal, and people with asthma, mold allergy, weakened immune systems or chronic lung disease are the groups at real risk from any of them.
Should I get the mold tested first?
CDC does not recommend mold testing, and EPA says that in most cases, if visible mold growth is present, sampling is unnecessary. There are no federal standards for acceptable mold levels, so a result cannot be compared against a limit. Testing has a genuine use after remediation, to confirm the work succeeded, and in a dispute where someone needs documentation.
Will it come back?
If the moisture source is still there, yes, in the same place. That is the single best predictor. Growth that returns to the identical square foot after a proper cleaning is telling you the water problem was never found.
Sources
Every source cited on this page
- T1Mold Cleanup in Your Home — US EPA (accessed 2026-08-25)
- T1A Brief Guide to Mold, Moisture and Your Home — US EPA (accessed 2026-08-25)
- T1Mold Remediation in Schools and Commercial Buildings, Table 2 — US EPA (accessed 2026-08-25)
- T1Facts About Stachybotrys chartarum — CDC (accessed 2026-08-25)
- T1About Mold and Health — CDC (accessed 2026-08-25)
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