Google Rating
4.9
78 reviews

Is Your Home Making You Sick? Find Out Today

Mold Testing & Inspection Services in Greater Saint Louis
Air and swab testing services
Clear, detailed lab reports
Cultured by an independent lab
everywhere

Call or text our owner Dave for help with your mold problem

(314) 916-6533

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Free inspections
Air and swab testing services
Cultured by an independent lab
We can be there within a day

Certified mold inspectors

Same-week appointments

Real-time air results on the spot

As featured on

If your home is making you sick, the mold has to go.

Most mold companies treat mold like a construction problem. We treat it like the health problem it actually is. If any of these sound familiar, it's worth getting checked:

A musty or earthy smell that won't go away

Headaches, congestion, or fatigue that ease when you leave the house

Worsening allergies or asthma, especially in kids

Visible spots on walls, ceilings, or around vents

Referred by functional medicine & integrative health doctors

everywhere

why are you getting a mold test?

Our testing process helps uncover hidden mold and gives you reliable data you can trust.
01
Building & Health Review
We assess your home’s water history and your family’s symptoms to understand the full context before we begin the inspection.
02
Moisture Inspection & Testing
We identify moisture sources and collect targeted air samples using real-time monitoring to pinpoint the exact location of contamination.
03
Independent Lab Analysis
All samples are processed by an accredited third-party laboratory to guarantee scientifically accurate and completely unbiased results.
04
Result Review
Within five days, we walk you through the findings using our proprietary rubric to clarify the severity of the issue and your next steps.
View Case Studies
Need to remediate? Know your options

Most companies tear out your walls. We don't have to.

Traditional remediation means demolition, weeks of disruption, and moving out, often leaving spores behind in the dust, ducts, and soft goods. Our process treats the entire home environment at once.

Typical contractor

Whole-home dry fog, minimal demo

Treats air, surfaces & cavities

Often done in a single visit

Retest + 1-year guarantee

Claro

Rip out drywall & rebuild

Treats only visible mold

Days or weeks of demo

No proof it's actually clean

everywhere

1,000s of life-changing stories

Dave who owns and runs Claro is the most amazing person. I called him as I was struggling with sinus issues and migraines. He tested many areas in our house. He has helped us endlessly to resolve our problems. Thanks Dave for your kindness and intelligence and your care and concern. You are the BEST!!

Candace C

St. Louis, MO
I had a great experience with Claro St. Louis. Their team was professional, thorough, and explained everything clearly. I’m really grateful for the quality of their work and highly recommend them to anyone dealing with mold issues!

Monica A

St. Louis, MO
I can’t say enough good things about Claro! The team is patient, knowledgeable, and genuinely invested in helping me understand everything. They managed to come out the SAME day I called, completed air testing on the spot, and I had official independent lab results back within just a few days. Absolutely recommend!

Amy B

Kirkwood, MO
We’d noticed a faint mildew smell around the HVAC vents and weren’t sure if it was worth digging into. Dave at Claro told me about their “test first, treat only if needed” approach — no pressure, just honesty. They ran the air test, found elevated spores, then scheduled fog treatment. A few hours later we were done. The smell disappeared within a day!

Grant S

St. Charles, MO
The first of its kind here in town. So great to have a safe mold remediation option in STL. There is nothing better you can do for the health of your family than making sure your house is mold-free! They offer mold inspections and make it easy.

Margaret H

Brentwood, MO
Basement had damp patches after a rain leak last summer. We cleaned it up, but the air still felt stale with patches of visible mold. Called Claro. Dave came, tested the air, confirmed elevated spores, but said fogging only makes sense once the leak was fixed — which it was. They treated the house the next afternoon, re-tested — and everything was clean. No drama, no mess. Just a safe, fresh home.

Michael B

St. Louis, MO
I lean toward skepticism when I hear about "one-day mold fixes," but Claro proved me wrong. Dave was honest about what could and couldn't be done. They tested the air, confirmed there was an issue, then fogged the house in one afternoon. By the next day air tests were clear and the stale odor was history. House feels cleaner, fresher -- I sleep better now.

Joe P

St. Louis, MO
Dave who owns and runs Claro is the most amazing person. I called him as I was struggling with sinus issues and migraines. He tested many areas in our house. He has helped us endlessly to resolve our problems. Thanks Dave for your kindness and intelligence and your care and concern. You are the BEST!!

Candace C

St. Louis, MO
I had a great experience with Claro St. Louis. Their team was professional, thorough, and explained everything clearly. I’m really grateful for the quality of their work and highly recommend them to anyone dealing with mold issues!

Monica A

St. Louis, MO
I can’t say enough good things about Claro! The team is patient, knowledgeable, and genuinely invested in helping me understand everything. They managed to come out the SAME day I called, completed air testing on the spot, and I had official independent lab results back within just a few days. Absolutely recommend!

Amy B

Kirkwood, MO
We’d noticed a faint mildew smell around the HVAC vents and weren’t sure if it was worth digging into. Dave at Claro told me about their “test first, treat only if needed” approach — no pressure, just honesty. They ran the air test, found elevated spores, then scheduled fog treatment. A few hours later we were done. The smell disappeared within a day!

Grant S

St. Charles, MO
The first of its kind here in town. So great to have a safe mold remediation option in STL. There is nothing better you can do for the health of your family than making sure your house is mold-free! They offer mold inspections and make it easy.

Margaret H

Brentwood, MO
Basement had damp patches after a rain leak last summer. We cleaned it up, but the air still felt stale with patches of visible mold. Called Claro. Dave came, tested the air, confirmed elevated spores, but said fogging only makes sense once the leak was fixed — which it was. They treated the house the next afternoon, re-tested — and everything was clean. No drama, no mess. Just a safe, fresh home.

Michael B

St. Louis, MO
I lean toward skepticism when I hear about "one-day mold fixes," but Claro proved me wrong. Dave was honest about what could and couldn't be done. They tested the air, confirmed there was an issue, then fogged the house in one afternoon. By the next day air tests were clear and the stale odor was history. House feels cleaner, fresher -- I sleep better now.

Joe P

St. Louis, MO
Great customer care and service, when you call this company, you will be speaking to the owner. in today's world where there is no customer care any longer these guys rank a 10 out of 10. I cannot say enough about them. Highly recommended.

Bryan G

Franklin, TN
After the treatment, our family’s mold-related illnesses got better and air quality tests came back great!

Thomas D

Nashville, TN