Mold removal questions, answered
Short, straight answers to the questions Sonoma County homeowners ask us most. For more depth, start with our complete guide or the El Niño guide.
Frequently asked questions
Do I need a mold test?
Often not. The California Department of Public Health says that if you can see or smell mold or moisture, you don't need to measure it or identify the type; testing doesn't give more useful information. What matters is finding and fixing the moisture source and removing the mold.
Is there a mold license in California?
No. CDPH says California has no legal requirement for licensing or certifying mold assessors or remediators, though some hold national certifications (such as IICRC, NORMI or NAMRI). Construction work, such as replacing drywall, still requires a CSLB-licensed contractor above the legal threshold.
Can I clean mold myself?
The EPA says a homeowner can usually handle an area smaller than about 10 square feet if the moisture problem is fixed. For larger areas, mold from contaminated floodwater or sewage, or mold in HVAC systems, get professional help.
Is black mold more dangerous?
CDPH says any mold you can see or smell is a health risk and should be fixed, and there's currently no evidence the particular kind matters.
Do you do the remediation?
No. We're a free referral service that connects you with independent local providers who do the work and set their own prices.
How long does a mold inspection take?
For a typical home, often one to a few hours, longer if the crawlspace and attic are large or hard to access.
Will the inspector take air samples?
Some do. CDPH says that if you can see or smell mold or moisture, testing isn't needed and doesn't give more useful health information. Ask what any sampling is meant to answer.
Are home mold test kits worth it?
CDPH doesn't recommend them. If you see or smell mold, a test won't tell you anything you need to act on.
My test says indoor levels are higher than outdoor. What does that mean?
CDPH says the idea that higher indoor levels prove indoor growth hasn't been scientifically proven, and levels vary widely over time. Focus on finding moisture and visible growth.
How long does mold remediation take?
Small jobs can take a day. Larger jobs with containment, demolition and drying often take several days, plus time for repairs.
Do I need to leave my home during remediation?
CDPH advises that unprotected people avoid exposure during remediation. For larger jobs, ask the provider whether you should stay elsewhere.
Is crawlspace mold a problem if I never go down there?
Yes. Air moves from the crawlspace into the home, and ongoing moisture can damage framing and floors.
Do I need encapsulation?
Not always. Many crawlspaces improve with drainage fixes, gutter work and a vapor barrier. Ask the provider to explain why they're recommending a specific approach.
Is attic mold dangerous if it's above the ceiling?
Air moves between the attic and living space through fixtures and gaps, and ongoing moisture damages the roof structure. It's worth fixing.
Will a new roof fix attic mold?
Only if the roof was the moisture source. Ventilation and exhaust problems need their own fixes.
Can I save drywall that got wet in a flood?
With contaminated floodwater, usually not. Soaked drywall and insulation are typically cut out above the water line.
How soon will mold appear?
The EPA's 24 to 48 hour drying window is the key benchmark. Growth may not be visible right away, so dry thoroughly and watch for odors.