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Find Mold & toxic material testers in San Francisco

Avatar for Moisture & Restoration Consultants, LLC
Moisture & Restoration Consultants, LLC
4.8(
59
)

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 time10 hrs
14 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Mold Remedies
Mold Remedies
4.4(
30
)

Serving San Francisco, CA and surrounding areas

Approved

In business since 2002

Credit card accepted

Customers say: Super punctual

"These guys were professional, knew exactly where the mold was coming from and how to remove it. They were timely and did a great job!"
Areas of concern
 Dry Rot
Polluted Air
Clean air
We can make it happen

+15

Response time2 days
2 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Mold Test Company Central CA
Mold Test Company Central CA
4.0(
88
)

Serving San Francisco, CA and surrounding areas

Approved

In business since 2015

Emergency services offered

Small jobs welcome

"The inspector was professional and thorough. The report was timely and the company's representative called me to explain the results of the test. I've emailed him to request clarifications and am awaiting his reply. The only negative thing is that after our telephone conversation he transferred me to a 3rd party company who markets mold removal services. The rep there tried to sell me his product. I didn't buy it yet."
Attic Ceiling
Drywall
Drywall
Insulation
Insulation

+66

Response time10 hrs
249 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for Bio 911
Bio 911
5.0(
17
)

Serving San Francisco, CA and surrounding areas

Approved

In business since 2018

Free estimates

Credit card accepted

"Kirill was professional and knew exactly what to do. The mold testing was done quickly. Kirill sent the samples to the lab and provided feedback. He gave me the lab results and the steps that needed to be taken next to resolve the problem."
Mold contamination due to roof leak
Bird droppings contamination
Bird carcasses and bird droppings
Bird droppings contamination
Mold contamination due to roof leak

+29

Response time7 hrs
Response rate100%
3 neighbors recently requested a quote
Avatar for Environmental Science Services
Environmental Science Services
4.5(
42
)

Serving San Francisco, CA and surrounding areas

Approved

In business since 1992

Free estimates

Emergency services offered

"Shane was my first contact (via phone) and was very knowledgeable and went above & beyond to answer all my questions. I tend to have pretty good discernment, and I immediately sensed I was dealing with an honest, straightforward company. Shane offered me an appointment 2 days later that s fast! Awesome when you re concerned about mold! Ray came to our house (a several hour drive to the Redding area!), and was prompt & called ahead to be courteous. Total genuine and nice guy (especially bc he s a dog lover ;) He wasn t rushed at all, answered all our questions (we had a lot), and actually said he likes & welcomes questions! After we received our report & invoice, I THOUGHT I was messaging my husband, lol, but I texted Shane: Thumbs up! They did thorough testing, & the price was still what was initially quoted! I highly recommend these guys!!"
interior
IAQ
Clandestine Laboratory Investigation
Wipe Testing for Asbestos
Water Intrusion Mold Testing

+3

Response time8 hrs
4 neighbors recently requested a quote
Recommended by97%of homeowners
Avatar for Air Quality Testers
Air Quality Testers
4.2(
5
)

Serving San Francisco, CA and surrounding areas

Approved

In business since 2020

Small jobs welcome

Credit card accepted

Breathe Easier with Expert Mold Inspections and Environmental Air Testing. At Air Quality Testers, we specialize in Certified Indoor Air Quality and Mold Testing Services. Our experienced professionals evaluate your air quality, detect mold, and provide personalized solutions. Schedule Your Test Today for a Healthier Home or Office: Tailored Advice and Simple Solutions for Clean Air. We safeguard your space with comprehensive air quality and mold testing, ensuring peace of mind for you and your family.\n\nOur focus is on those concerned about the air quality in their homes or workplaces. We stand out by offering certified indoor air quality testing and mold inspections, thorough air quality assessments, tailored recommendations for improvement, and cutting-edge technology to uncover hidden mold and evaluate air conditions.

Crawlspace hatch
Crawlspace
Storage Room
Response time2 days
Response rate97%
Avatar for Bay Area Mold Pros
Bay Area Mold Pros
4.6(
10
)

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
Avatar for Isaacs Forensic Laboratories
Isaacs Forensic Laboratories
5.0(
6
)

Serving San Francisco, CA and surrounding areas

In business since 2000

Emergency services offered

Small jobs welcome

"I had a great experience with Isaac Forensic. Rafi and team responded quickly in an urgent situation, cleaned and fixed the mold problem the same day and in a short time. I am extremely happy with the service and the knowledge that Rafi demonstrated through the process. Highly professional and realizable. I would definitely recommend them!"
Response time7 hrs
Response rate97%
Avatar for Fire & Water Damage Recovery
Fire & Water Damage Recovery
4.7(
69
)

Serving San Francisco, CA and surrounding areas

In business since 1997

Free estimates

Emergency services offered

"We identified mold in the kitchen/bathroom shared wall and needed mold remediation. Erik came in for a visit and honest quote. Then he was responsive in working with our insurance company to finalize a cost estimate. The mold remediation job was done by Angel and his team. They were on time, polite, professional and very easy to work with. Angel even identified more water damage area and helped to fully address and contained. Highly recommend the team and the company to anyone who needs professional service."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+27

Recommended by88%of homeowners
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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.