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Top-Rated Mold & toxic material testers in San Francisco - Updated Nov 2026

Avatar for Moisture & Restoration Consultants, LLC
Moisture & Restoration Consultants, LLC
4.8(
61
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

Approved

In business since 1994

Emergency services offered

Warranties offered

"Dave was extremely helpful in giving grounded, low cost solutions for my ongoing mold issue. Proving sound and reliable advice in a sea of so much overwhelming information was invaluable. He took the time to look over a previous report that provided misguided information and recommendations and took the time to walk me through the correct steps saving me so much time and headache. Thank you so so much. I highly recommend this company for their mold services and consult."
Mold Remediation Project
Master Bathroom
Master Bathroom
Hall Bathroom
Hall Bathroom

+27

Response time4 hrs
11 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for Mold Remedies
Mold Remedies
4.4(
30
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

Approved

In business since 2002

Free estimates

Small jobs welcome

"Incredibly smart pro, learned a ton from the visit and I think we found valuable information about our property from the results of the tests conducted."
Mold Inspection
Mold Inspection
Mold Inspection
Mold Inspection
Mold Inspection

+2

Response time2 days
Response rate100%
2 neighbors recently requested a quote
Avatar for Mold Test Company Central CA
Mold Test Company Central CA
4.0(
90
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

Approved

In business since 2015

Emergency services offered

Small jobs welcome

"They weren't forthcoming about additional testing. Base inspection $299 then additional $400+ for lab testing. Wish I had known for vendor comparison purposes. However, I think it was worth it. Owner said the techs need to be instructed to say it was optional, but it helps you better understand the mold your dealing with. Glad I did it but not sure if it could have been done for less."
Attic Ceiling
Drywall
Drywall
Insulation
Insulation

+66

Response time10 hrs
136 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Bio 911
Bio 911
4.9(
92
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Air / Mold testing done Very professional was able to come out the next morning for testing and results available 24-30 hrs later MrKirill Answered many of my questions prior to me even booking an appointment. After testing explain the results and what aftercare would be needed"
Mold under window
mold on concrete foundation
after treatment
after remediation
Hoarding cleanup

+18

Response time5 hrs
Response rate98%
1 neighbors recently requested a quote
Avatar for Isaacs Forensic Laboratories
Isaacs Forensic Laboratories
5.0(
5
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

Approved

In business since 2000

Free estimates

Credit card accepted

You can't manage everything that happens around your property, but you can keep your work environment safe for all employees and customers. \n \nHave peace of mind knowing that your property has clean indoor air quality and complies with structural safety standards set by the industry. Hire Isaac's Forensic Laboratories to get rid of dangerous elements that may be present in your home. We provide comprehensive environmental consulting services in Rio Vista, Fairfield, Stockton, CA and around the Bay Area. From asbestos and mold to radon and lead, we can check your building for a variety of volatile organic compounds and hidden dangers.

Photos
Mold Inspection
Mold Abatement
Asbestos Testing
Asbestos Removal

+1

Curtis Roberts Mold Inspection
4.5(
175
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

In business since 2004

Free estimates

Credit card accepted

"Curtis was quick to respond, showed up the next day on time, and was in and out in very little time. I even got my results the same day which was amazing. This is a rental property I had him test, and as they say, time is money. And having the testing & results that quickly with a letter stating it was clear of mold to cover me legally was exactly what I needed."
Under Kitchen Sink
Bathroom Cabinet
Response time3 hrs
Recommended by95%of homeowners
A1 Certified Environmental
4.6(
422
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

In business since 2003

Credit card accepted

"I looked around for mold testing help for a few days; I threw all of my belongings out according to recommendations online. When Carl arrived, he put my worries to rest and I am so very glad I will have the right test in hand in just a few days. I feel like a huge weight is off of my shoulders. Praise God! -Jill"
Visible signs under sink
Damp crawlspace
Peeling paint (ceiling)
Air sampling
Response time3 hrs
Recommended by92%of homeowners
Avatar for Bay Area Mold Pros
Bay Area Mold Pros
4.6(
10
)
Mold & Toxic Material Test

Serving San Francisco, CA and surrounding areas

In business since 2017

Free estimates

Credit card accepted

"Rick was pretty knowledgeable about mold and the process that creates it and how it should be treated. Took no more than about 30 minutes and he answered all my questions thoroughly. Really appreciate the help."
Response time4 hrs
Recommended by100%of homeowners
Showing 1-10 of 49
FAQs for mold & toxic material test projects in San Francisco, CA

Some companies offer a no‑cost phone or video consultation that screens for red flags. If the discussion points to a real issue, the pro will recommend a paid on‑site inspection. The complimentary call clarifies whether you need full testing, but it isn’t a substitute for samples, lab work, or a written report. Always confirm what the free service covers before you schedule.

A standard inspection, which includes basic air and surface samples, takes an average of two hours. If the pro needs to probe hidden spaces, such as wall cavities or ductwork, plan on up to six hours. Extra time allows the inspector to reach tight areas, collect additional samples, and document findings. Lab analysis is a separate process and often adds several business days to the overall timeframe before you receive the full report.

Mold thrives where moisture lingers and air flow is poor. Common hotspots include bathroom walls, kitchen backsplashes, window sills, HVAC vents, fireplaces, crawl spaces, and enclosed attics. Check these areas regularly—especially after leaks or high‑humidity weather—to catch growth early and avoid costly repairs.

Unchecked mold can knock 20% to 37% off a home’s market value because buyers worry about hidden damage and health risks. Even after remediation, visible staining or a history of major moisture issues can still lower offers and prolong the time on the market. Addressing mold quickly protects both your property’s structural integrity and its resale appeal.

The San Francisco, CA homeowners’ guide to mold & toxic material tests

From average costs to expert advice, get all the answers you need to get your job done.