Los Angeles County · Black mold removal services
Black Mold Removal in Los Angeles
Black mold removal means finding the water that feeds the mold, sealing off the area, cutting out moldy drywall and insulation, HEPA cleaning what stays, and confirming the result with a clearance test. Most Los Angeles jobs run $1,500–$6,000, small ones less. Color alone can’t tell you if it’s Stachybotrys; a lab can.
- Emergency24/7 response
- CoverageAll of Los Angeles County
- PricingWritten quote before work starts
- StandardANSI/IICRC S520
- Call(213) 659-0672
The facts first
What is black mold, really?
“Black mold” usually means Stachybotrys chartarum, a greenish-black mold that grows on materials that stay wet for days or weeks, like drywall paper, ceiling tiles, wood and cardboard. It needs a lot of water, so finding it usually means there’s a real leak, not just a humid bathroom.
But most dark mold in Los Angeles homes isn’t Stachybotrys. Cladosporium, Alternaria and Aspergillus can all look black or dark green. Black spots on shower grout are usually one of these, or plain mildew.
Can you tell black mold by its color?
No. Color depends on the species, its age, the material it’s growing on and the light you’re looking in. The only way to confirm Stachybotrys is a sample (a tape lift, swab or piece of material) examined by an accredited lab, ideally one accredited under the AIHA-LAP program.
What most companies leave out: removal is the same whatever the species. The EPA and CDC both say any indoor mold growth should be removed and the moisture fixed. A lab result helps with documentation, not with the method.
When is a black mold test worth paying for?
- You need written proof for a landlord, insurer or home sale
- You smell mold but can’t find where it’s growing
- Someone in the home has asthma, allergies or a weakened immune system
For a small, visible patch with a known cause, testing won’t change the fix. See how our mold inspections work.
Health
Is black mold dangerous to your health?
Black mold is worth taking seriously, but it isn’t the instant poison some websites describe. According to the CDC, damp and moldy homes, whatever the species, can cause a stuffy nose, wheezing, red or itchy eyes, or itchy skin, often worse in people with allergies or asthma.
People with weakened immune systems or chronic lung disease can face more serious problems, including infections. The CDC notes that links between black mold and rare conditions such as memory loss have not been proven.
Stachybotrys can produce mycotoxins, but that doesn’t change the practical advice: remove the mold, fix the water, and keep people with health concerns away from the work.
Talk to your doctor
If you think symptoms are related to mold, see a doctor and mention the exposure. We’re mold professionals, not medical providers. An air quality test can show whether indoor spore levels are higher than outdoors. How air quality testing works.
Bleach and DIY sprays
Why doesn’t bleach get rid of black mold?
Bleach can clean mold off hard, non-porous surfaces like tile, glass and sealed counters. On porous materials such as drywall, wood, ceiling tiles and carpet, mold grows into the material with root-like threads called hyphae. Bleach mostly lightens the surface stain, and its water can soak in and feed what’s left underneath.
Bleach does nothing about the leak, and dead mold can still cause allergic reactions. That’s why EPA guidance focuses on removing moldy porous materials and drying, not killing mold. On hard surfaces, LA County Public Health advises no more than one cup of bleach per gallon of water, never mixed with ammonia.
| Material | Can it be cleaned? | What usually happens |
|---|---|---|
| Tile, glass, metal, sealed counters | Yes | Scrub with detergent and water, dry completely |
| Solid wood framing and subfloor | Usually | HEPA vacuum, wire brush or sand, then dry to normal moisture |
| Drywall and its paper facing | Rarely | Cut out at least a foot past visible growth, bagged and removed |
| Insulation, ceiling tiles, carpet pad | No | Removed and replaced |
| Upholstery, mattresses, cardboard | Case by case | Often discarded if growth is visible or it was soaked |
General guidance based on EPA and IICRC S520 practice. The scope for your home depends on what we find.
Our process
How do professionals remove black mold?
Professional black mold removal follows the same steps as any careful mold remediation job, built on the ANSI/IICRC S520 standard and EPA guidance. The goal is to take the mold out without spreading spores to the rest of the house, then prove it’s gone.
- Inspect and find the waterMoisture meters and thermal imaging show how far the wet area goes, often past the visible spots. If you need a plumber or roofer first, we say so.
- Write the scope and priceRooms, square footage, what comes out, containment, drying and how success is measured, in writing.
- Contain the areaPlastic sheeting, zipper doors and a HEPA air scrubber keep the work zone under negative pressure, so spores stay inside.
- Remove what can’t be cleanedMoldy drywall, insulation and carpet are cut out, bagged inside the containment and carried out sealed.
- Clean and dryFraming and remaining surfaces are HEPA vacuumed, scrubbed or sanded and wiped, then dried with dehumidifiers until moisture readings are back to normal.
- Verify, then rebuildA visual check, moisture readings and clearance air samples compared with an outdoor control. We recommend an independent tester for this step. Only then does containment come down.
Most jobs take one to five days. In pre-1978 homes, drywall compound, popcorn ceilings and paint are tested for asbestos and lead before anything is cut.
DIY or professional
Can I remove black mold myself?
Often, yes. The EPA’s rule of thumb is that a homeowner can usually clean an area under about 10 square feet, roughly 3 feet by 3 feet, if it’s on a hard surface and the moisture is fixed. Bigger areas, mold inside walls, or growth after sewage or floodwater call for a professional.
| Situation | Usually DIY | Call a professional |
|---|---|---|
| Size | Under about 10 sq ft | Over 10 sq ft, or several rooms |
| Material | Tile, glass, sealed surfaces | Drywall, insulation, carpet, ceilings |
| Location | Visible and reachable | Inside walls, attics, crawl spaces, HVAC ducts |
| Water source | Clean water, already fixed | Sewage, floodwater, or an unknown leak |
| Who lives there | Healthy adults | Anyone with asthma, allergies, lung disease or a weakened immune system |
- Protect yourself: an N-95 respirator, rubber gloves and goggles without vent holes.
- Scrub, don’t just spray: detergent and water on a stiff brush, then wipe and dry completely.
- Don’t paint over it: paint and caulk over mold peel and the growth continues underneath.
- Fix the moisture: run the bathroom fan and repair the drip. If it comes back, the water source hasn’t been found.
Pricing
How much does black mold removal cost in Los Angeles?
Black mold removal costs the same as any other mold remediation, because the work is the same. Most Los Angeles homes fall between $1,500 and $6,000. A small area under a sink can be under $1,500, while whole-house or structural jobs can pass $10,000. You’ll get a written quote before work starts.
| Service | Typical range |
|---|---|
| Inspection with moisture mapping | $250–$500 |
| Inspection with air samples (incl. outdoor control) | $400–$800 |
| Each additional air or surface sample (e.g. to confirm Stachybotrys) | $75–$150 |
| Small removal (under 10 sq ft, one area) | $500–$1,500 |
| Standard removal (bathroom, closet, wall section, crawl space section) | $1,500–$6,000 |
| Large, whole-house or structural removal | $10,000–$30,000+ |
| Clearance testing after removal | $300–$600 |
Typical industry ranges for the Los Angeles area. Your written quote depends on the size, access and materials involved.
Price depends on square footage, how much drywall and insulation comes out, access (crawl spaces and hillside homes take longer), asbestos or lead testing in older homes, and rebuild. A quote that charges extra just because the mold is “black” is a red flag.
Local conditions
Where does black mold grow in Los Angeles homes?
In LA, black mold shows up where water collects unseen: behind walls, under floors and above ceilings. Dry summers don’t protect a home with a slow leak.
Behind sinks and toilets
Slow drips from supply lines, drains and wax rings soak the drywall and cabinet floor for months before anyone notices.
Ceilings after winter storms
Most of LA’s rain falls from November to March in a few heavy storms. Roof and window leaks wet ceiling drywall and attic insulation.
Crawl spaces in the hills
Raised foundations in Silver Lake, Mount Washington and the Hollywood Hills collect slope runoff, especially without a vapor barrier.
AC closets in the Valley
Clogged condensate lines and sweating ducts in Sherman Oaks, Van Nuys and North Hollywood wet the walls around air handlers.
Slab leaks and baseboards
A leaking pipe under a slab foundation wicks water up into baseboards, carpet pad and the bottom of the drywall.
Older apartment bathrooms
Pre-1978 buildings in Koreatown, Westlake and Hollywood often lack exhaust fans and have aging plumbing inside shared walls.
If it followed a burst pipe or storm, fast drying matters as much as removal. See mold after water damage.
For renters
Black mold in your apartment? Who pays and who to call
In California, removing mold caused by leaks or building defects is generally the landlord’s job. Since SB 655, visible mold growth can make a unit substandard under Health & Safety Code 17920.3, apart from minor mold on surfaces like a shower.
- Tell your landlord in writing and keep a copy.
- Take dated photos with something in the frame for scale.
- If nothing happens, call your city’s code enforcement office or LA County Public Health. In the City of LA, the Housing Department inspects for free.
California law protects tenants from retaliation for complaining (Civil Code 1942.5). Withholding rent is risky, so talk to legal aid first. Paid testing helps with documentation, but you don’t need it to file a complaint.
General information, not legal advice.
FAQ
Black mold removal: frequently asked questions
Is it black mold? How do I test for black mold?
You can’t tell by color, because many molds look black. To confirm Stachybotrys chartarum, a tape lift, swab or material sample has to be examined by an accredited lab. Home test kits can show that mold spores exist, which is true of almost every home, but they don’t tell you where the mold is growing or how much there is.
Is black mold more dangerous than other mold?
Any indoor mold can cause a stuffy nose, wheezing, itchy eyes or skin irritation, especially in people with allergies or asthma, according to the CDC. The CDC says links between black mold and rare conditions like memory loss have not been proven. All indoor mold should be removed the same careful way. If you have symptoms, talk to your doctor.
Will bleach kill black mold?
Bleach can clean mold off hard, non-porous surfaces like tile, but it won’t fix mold growing into drywall, wood or carpet, and it does nothing about the moisture causing it. Moldy porous materials usually need to be removed. Never mix bleach with ammonia or other cleaners.
Can I remove black mold myself?
Usually, if the area is under about 10 square feet on a hard surface and the leak is fixed. Wear an N-95 respirator, gloves and goggles, scrub with detergent and water, and dry it completely. Call a professional for larger areas, mold inside walls or ducts, growth after sewage or floodwater, or if anyone in the home has health concerns.
How much does black mold removal cost in Los Angeles?
Typical Los Angeles ranges are $500–$1,500 for a small area, $1,500–$6,000 for a bathroom, closet or wall section, and $10,000 or more for whole-house or structural jobs. Clearance testing usually adds $300–$600. Your written quote depends on size, access and materials.
Can I stay in my home during black mold removal?
Usually, yes. The work area is sealed with plastic and kept under negative pressure so spores stay inside. If the area is large, near bedrooms, or someone has asthma or a weakened immune system, staying elsewhere until clearance may be the better choice.
Should the same company test and remove the mold?
It’s better if they don’t, at least for the final clearance test. A company that profits from removal has a reason to find more mold and to pass its own work. We recommend independent clearance testing so the result is checked by someone with nothing to gain.
Will black mold come back after removal?
Not if the moisture source is fixed and materials are dried to normal levels. Most repeat black mold problems trace back to a leak, a condensate line or a ventilation problem that nobody addressed the first time.
Sources
- CDC, mold and health basics: cdc.gov/mold
- U.S. EPA, mold cleanup and the 10 sq ft guideline: epa.gov/mold
- LA County Department of Public Health, Environmental Health: publichealth.lacounty.gov
- Los Angeles Housing Department: housing.lacity.gov
- ANSI/IICRC S520, Standard for Professional Mold Remediation; California Health & Safety Code 17920.3; Civil Code 1942.5
Last updated October 2026
Found dark mold and not sure what to do next?
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