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Quick answer
Usually yes, if the patch is small. EPA's wording: "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." [2] Fix the water problem first, wear an N-95 respirator, long gloves and goggles, scrub hard surfaces with detergent and water, and dry them completely. [2][3] A mold remediation company makes sense if the mold is bigger than that, hidden inside walls or the HVAC system, or came from sewage or other contaminated water, where EPA says to call in an experienced professional. [3]
Do this first: measure the mold and find the water
Answer two questions first: how big is the moldy area, and what is feeding it? EPA says the way to control indoor mold growth is to control moisture. [1] If you clean up the mold but do not fix the water problem, EPA says the mold will most likely come back. [2]
Measure the patch. Multiply its length by its width in feet. A 3 ft by 3 ft patch is 9 square feet, just under EPA's line of about 10 square feet. [2]
Find the water. Look for a dripping pipe, a roof or window leak, or condensation near the mold. EPA says to fix plumbing leaks and other water problems as soon as possible. [3]
Ask where the water came from. If the water or mold damage was caused by sewage or other contaminated water, EPA says to call in a professional. [3]
Think about the HVAC. If you suspect mold in your heating, ventilation or air conditioning system, do not run it. EPA says it could spread mold throughout the building. [3]
Check your health first. EPA says that if you have health concerns, consult a health professional before starting cleanup. [3]
Skip the mold test. EPA says that in most cases sampling is unnecessary when mold is visible, and CDC says all molds are treated the same for removal. [2][4]
Leak still active near power?
If water is near outlets, cords or the electrical panel, do not walk into it. Turn power off at the panel only if you can reach it from a dry spot; otherwise call your utility or an electrician. Stay out from under any ceiling that is sagging.
Can you clean mold yourself? What EPA actually says
EPA's guide for homeowners puts it this way: "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."[2]
Size is not the only test; EPA says it is one of several factors. For larger jobs, EPA's wording is "If there has been a lot of water damage, and/or mold growth covers more than 10 square feet," consult its guide written for remediation in schools and commercial buildings. [3]
A DIY cleanup is usually reasonable when all of these are true:
The mold is on a hard surface you can scrub, such as tile, a tub or a sink. [3]
You found the water source and fixed it.
The water was clean, not sewage or other contaminated water. [3]
The mold is not inside a wall or the HVAC system. [2]
The person cleaning does not have allergies, asthma, COPD, immune suppression or underlying lung disease. [5]
What to wear before you touch it
EPA says to avoid breathing mold spores, getting them in your eyes, or touching mold with bare hands. [2]
N-95 respirator. EPA says you may want to wear one to limit what you breathe, and it must fit properly, so follow the maker's instructions. [2] CDC says to wear at least a NIOSH Approved N95 respirator, and a half-face or full-face respirator if you plan to spend a lot of time on work like ripping out moldy drywall. [5]
Long gloves. EPA recommends gloves that reach the middle of the forearm. It says ordinary household rubber gloves may be used with water and a mild detergent; with a disinfectant, bleach or a strong cleaner, choose natural rubber, neoprene, nitrile, polyurethane or PVC. [2]
Goggles without vent holes. EPA recommends goggles that do not have ventilation holes. [2] CDC warns that safety glasses or goggles with open vent holes will not protect you against dust and small particles. [5]
FEMA says children should not take part in disaster cleanup work; keep them away from mold cleanup too. [6] CDC says people with allergies, people with immune suppression or underlying lung disease, and people with chronic respiratory diseases such as asthma or COPD should not take part in cleaning up. People with asthma, COPD or a weakened immune system should not stay in a moldy home or be there while it is being cleaned. [5] CDC also notes that damp and moldy spaces may cause a variety of health effects, or none at all. [7] If you have symptoms or a health question, talk to a doctor.
How to clean mold off hard surfaces, step by step
These steps follow EPA's cleanup tips for a small patch on a hard surface, such as bathroom tile, a sink or a tub surround. [3]
Fix the water problem first. Repair the leak, drip or condensation feeding the mold, or the cleanup will not last. [3][2]
Put on your N-95 respirator, long gloves and goggles without vent holes. [2]
Open windows or doors to let in fresh air while you use cleaning products. [5]
Mix detergent and water in a bucket. CDC says dish detergent can be used to clean mold in your home. [5]
Scrub the mold off the hard surface with the detergent and water. [3] Do not touch the mold with bare hands. [2]
Dry the surface completely, along with anything else that got wet. [3] EPA says that if wet or damp materials are dried within 24 to 48 hours of a leak or spill, in most cases mold will not grow. [2]
Bag and remove porous items that have become moldy, such as ceiling tiles and carpet. EPA says these may have to be thrown away. [3]
Wait to paint or caulk until the mold is gone and the surface is dry. EPA says paint applied over moldy surfaces is likely to peel. [3]
Check the spot again soon after. EPA says it should show no signs of water damage or mold, and mold will most likely return if the water problem is not fixed. [2]
Stop if it is bigger than it looked
If cleaning uncovers mold under wallpaper, behind paneling or inside a wall, stop. EPA warns that removing wallpaper with mold on its underside can lead to a massive release of spores, and says to consider hiring an experienced professional if you believe you have a hidden mold problem. [2]
What to throw away instead of cleaning
Some materials cannot be scrubbed clean. EPA says porous materials, such as ceiling tiles and carpet, may have to be thrown away if they become moldy, because mold can fill in their empty spaces and crevices. [3] After a flood, FEMA says items that cannot be properly cleaned and dried within 24 to 48 hours must be removed and thrown away. [6]
Moldy carpet, and carpet you cannot clean and dry within 24 to 48 hours. [3][6]
Other soft, absorbent items that grew mold or cannot be cleaned and dried completely in that window. [6]
For an expensive or sentimental item, or one you are unsure how to clean, EPA says you may wish to consult a specialist and check references. [2] Take photos of anything you discard, for an insurance claim. [6]
Should you use bleach on mold?
EPA says not as a routine step. Its bleach guidance says using a chemical or biocide that kills mold "is not recommended as a routine practice during mold cleanup," though professional judgment may call for it in some cases, such as when people with weakened immune systems are present. [8]
EPA adds two points. In most cases it is not possible or desirable to sterilize an area; a background level of mold spores will remain, and those spores will not grow if the moisture problem has been resolved. And dead mold may still cause allergic reactions in some people, so it has to be removed, not just killed. [8]
CDC is a little more open to bleach. It says bleach or dish detergent can be used to clean mold in your home, and if you use bleach, use no more than 1 cup of bleach in 1 gallon of water. [5] If you do use bleach or another disinfectant, follow these safety rules:
Never mix bleach with ammonia or any other cleanser. [5] EPA warns never to mix chlorine bleach with cleaning solutions or detergents that contain ammonia, because toxic fumes could be produced. [8]
Ventilate. If you use a disinfectant or biocide, EPA says to ventilate the area and exhaust the air to the outdoors. [8]
Wear the right gloves: natural rubber, neoprene, nitrile, polyurethane or PVC. [2]
Bleach does not fix the leak. Mold most likely comes back if the water problem is not fixed. [2]
When to stop and call a mold remediation company
Stop the DIY job and get professional help in any of these situations:
Bigger than about 10 square feet, or there has been a lot of water damage. EPA points these jobs to its remediation guide for larger buildings. [3]
Inside walls or hidden. A moldy smell with no visible source, or mold under wallpaper or inside walls. EPA says to consider hiring an experienced professional. [2]
In the HVAC system. Do not run it if you know or suspect it is contaminated with mold. [3]
After sewage or other contaminated water. EPA says to call in a professional with experience cleaning and fixing buildings damaged by contaminated water. [3] This is Category 3 water, grossly unsanitary water that can carry pathogens. [9] Wear gloves, boots and eye protection near it, and keep children and pets away.
Health concerns. CDC lists people who should not take part in cleanup (see above). [5]
It keeps coming back. EPA says mold most likely returns when the water problem is not fixed. [2] Repeat growth usually means moisture is still getting in, possibly inside a wall.
DIY or pro? Mold cleanup by situation, based on EPA and CDC guidance
Situation
Usually
What the guidance says
Small patch under about 10 sq ft on a hard surface, clean-water leak fixed
DIY
In most cases you can handle the job yourself. Scrub with detergent and water, dry completely.
Mold over about 10 sq ft, or a lot of water damage
Pro
EPA points to its remediation guide for schools and commercial buildings.
Moldy smell with no visible source, or mold behind wallpaper or inside walls
Pro
Consider an experienced professional. Removing moldy wallpaper can release a massive amount of spores.
Mold in heating, ventilation or air conditioning
Pro
Do not run the system. It could spread mold throughout the building.
Damage from sewage or other contaminated water
Pro
Call in a professional experienced with buildings damaged by contaminated water.
Someone in the home has asthma, COPD, allergies or a weakened immune system
Someone else or a pro; talk to a doctor
These people should not take part in cleanup. Consult a health professional before starting.
Moldy ceiling tiles or carpet in a small area
DIY
Porous materials may have to be thrown away if they become moldy.
Mold returns after you cleaned and dried the area
Pro if the source is hidden
If the water problem is not fixed, the mold will most likely come back.
Before you hire, EPA says to make sure the contractor has experience cleaning up mold, check references, and ask them to follow EPA guidance or guidelines such as ACGIH's or IICRC's. [3] For budgeting, HomeAdvisor's June 2026 cost guide puts mold remediation at an average of $2,368, with a typical range of $1,223 to $3,757. [10]
Homeowner insurance usually does not cover mold unless it comes from water damage the policy covers, and some insurers provide limited mold coverage, according to Washington's insurance commissioner. [11] Check your own policy and talk with your insurer. Renters: EPA says to report all plumbing leaks and moisture problems immediately to the building owner, manager or superintendent. [2] Do it in writing and keep a copy.
Common questions
How much mold can I clean up myself?
EPA says that if the moldy area is less than about 10 square feet, roughly a 3 ft by 3 ft patch, in most cases you can handle the job yourself. [2] Size is only one factor. EPA says to call in an experienced professional when the damage came from sewage or other contaminated water, and not to run an HVAC system you suspect is contaminated with mold. [3]
Is it safe to clean mold yourself?
For a patch under about 10 square feet, EPA says that in most cases you can handle the job yourself. Wear an N-95 respirator, long gloves and goggles without vent holes. [2] CDC says people with allergies, asthma, COPD, immune suppression or underlying lung disease should not take part in cleanup. [5] Ask a doctor if you have health concerns.
Should I use bleach or detergent to clean mold?
EPA does not recommend bleach or other biocides as a routine part of mold cleanup, and its tips call for scrubbing hard surfaces with detergent and water. [8][3] CDC says either can be used; if you use bleach, use no more than 1 cup in 1 gallon of water, and never mix it with ammonia or any other cleanser. [5]
Do I need to test the mold before I clean it?
Usually not. EPA says that in most cases, if visible mold growth is present, sampling is unnecessary. [2] CDC says it is not necessary to know what type of mold you have, because all molds should be treated the same for health risks and removal. [4]
Can I paint over mold?
No. EPA says not to paint or caulk moldy surfaces. Clean up the mold and dry the surface first, because paint applied over moldy surfaces is likely to peel. [3]
Why does mold keep coming back after I clean it?
Usually because the moisture is still there. EPA says that if you clean up the mold but do not fix the water problem, the mold will most likely come back. [2] If the source seems to be hidden inside a wall, EPA says to consider hiring an experienced professional when you believe you have a hidden mold problem. [2]
