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Top-Rated Mold testing and remediation specialists in Sullivan - Updated Nov 2026

Avatar for Claro Complete Mold Remediation - St. Louis
Claro Complete Mold Remediation - St. Louis
4.8(
76
)
Toxicity and Mold - RemovalMold & Toxic Material Test - For BusinessToxicity and Mold - Removal - For Business

Serving Sullivan, MO and surrounding areas

Approved

In business since 2006

Free estimates

Warranties offered

At Claro - Complete Mold Remediation - St. Louis, we believe a healthy home starts with the air you breathe. We help families and businesses find mold, fix it at the source, and feel at home again. We serve St. Louis, Clayton, Ladue, Kirkwood, Webster Groves, Creve Coeur, Chesterfield, Ballwin, St. Charles, O’Fallon and surrounding areas. Our services include mold inspection, lab-based mold and air testing with same-day assessments, whole-home and crawlspace mold remediation, water damage cleanup, and commercial mold remediation. \n\nEvery job follows a source-first process: containment, moisture correction, physical removal of contaminated materials, structural drying, and a whole-home dry fog treatment that reaches hidden spores in walls, vents and crawlspaces. We work directly with your insurance company and build every plan around your home and the people living in it.

Crawlspace Waterproofing
Crawlspace Waterproofing
Crawlspace Waterproofing
Crawlspace Waterproofing
4 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for Mold One Missouri
Mold One Missouri
4.8(
21
)
Mold & Toxic Material TestToxicity and Mold - RemovalIndoor Air Quality Testing+2 more

Serving Sullivan, MO and surrounding areas

Approved

In business since 2022

Free estimates

Warranties offered

"Mike at Mold One was incredibly helpful. He gave me great information and lined up an appointment quickly for mold remediation. My wife has struggled literally her entire life with being sick and unwell and having chronic headaches and fatigue and poor sleep and mood swings and food allergies and the list goes on. We've been to countless doctors, bought countless supplements, tried several diets, done allergy testing, been to chiropractors, done hormone replacement therapy, etc. We recently found mold in our home and began looking into mold as a possible cause for her poor health. All of a sudden, things started lining up. Mold sickness symptoms are myriad, so nearly any symptoms could fit under mold sickness as a possible cause. We did a TON of research, found Mold One, did more research on their paracetic acid dry fog technique and found research articles from 3rd party labs supporting the effectiveness as well as safety of the procedure. My wife was pregnant at the time of treatment, so we wanted to be 100% sure that the treatment would be safe for her and for our baby and other young children. Once we were satisfied with the safety of the process, we hired Mold One and they had us lined up within the week. We only had to be out of our home for about 5 hours for the process. Upon returning, there was a faint vinegar smell in the house. My wife slept better that night than she ever had, and within 2 days, she was feeling SO MUCH BETTER. In fact, over the coming days/weeks, even though she was 8 months pregnant, she felt better then that she or I ever remember her being. She had energy, her mood was better, she slept better and needed less sleep. This was truly miraculous. We had tested the house for mycotoxins through Mycometrics prior to hiring mold one and found very high levels of Aspergillus. About a month after the mold treatment, my wife did a urinalysis through Great Plains Lab for mycotoxins and she was off the charts for Aspergillus. The body can take up to several years of detox to get all that out of the system, so no surprise that a month later it wasn't all gone. This was just proof that that mycotoxin was present at very high levels in her body as well as our home. And here's another shout out to the customer service and generosity of Mike and Mold One. About 2 months after the mold treatment, I was working on replacing my roof. A micro-storm came out of nowhere while I had the roof open and absolutely SOAKED everything. We had water dripping through the light fixtures inside and huge water spots showing all over our ceilings. This was hugely discouraging. After the storm passed, I called Mike and explained the whole thing and asked his advice since now we're a pitri dish for mold. Mike offered to send his guys back out to re-treat our home for free and consider it covered by warranty, even though it would have been easy and obvious to consider this new water damage not covered by warranty. I can't say enough of how great Mold One and Mike have been, and what a life changing impact their mold treatment of our home has had on my wife. Thank God that he led us to this solution for my family's health."
Total Home sterilization
bedroom
bathroom drains
moisture intrusion
black mold

+4

Response time11 hrs
Response rate96%
98 neighbors recently requested a quote
Avatar for Moldman Central MO
Moldman Central MO
4.8(
12
)
Toxicity and Mold - RemovalMold & Toxic Material TestMold & Toxic Material Test - For Business+1 more

Serving Sullivan, MO and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Very knowledgeable about the entire process. I would highly recommend them to everyone. They preformed there test and then scheduled a time for the removal process. They were very informative along the way. A+++++ all the way."
Mold on Concrete
Mold on Concrete
Attic After Mold Remediation
Basement Floor Joists with Mold
Basement Floor Joists with Mold

+11

Response time1 day
Response rate87%
15 neighbors recently requested a quote
Avatar for Mold Test Company IL
Mold Test Company IL
3.8(
106
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Sullivan, MO and surrounding areas

Approved

In business since 2008

Emergency services offered

Small jobs welcome

"Overall was good for what the service is. The technician was a postal worker and home inspector. So mold test company appears to be brokers. Their pricing was competitive from other quotes I received but I honestly think it was pricey for time spent and what they do. But like I said the price was pretty standard from the companies I called, in my opinion. But the technician was attentive and knowledgeable, and friendly."
Mold Inspection
Mold Inspection
Mold Inspection
Mold Inspection
Mold Inspection

+78

Response time1 day
258 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for MCC Cleaning & Restoration
MCC Cleaning & Restoration
4.4(
183
)
Toxicity and Mold - RemovalToxicity and Mold - Removal - For Business

Serving Sullivan, MO and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"Had water damage from basement flooding. They came in did their thing and cant even tell there was damage. Employees are very kind, finished on time and cleaned up their mess. High recommend!"
Air Duct Cleaning
Air Duct Cleaning
Air Duct Cleaning
Air Duct Cleaning
Air Duct Cleaning

+22

Response time2 days
1 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for Sam's Home and Commercial Inspectors LLC
Sam's Home and Commercial Inspectors LLC
5.0(
6
)
Indoor Air Quality TestingMold & Toxic Material TestMold & Toxic Material Test - For Business

Serving Sullivan, MO and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"I used this company twice and Sam was very prompt with responding and getting the inspection done within a few days. I got the inspection report same day. Even the realtor I'm with plans on recommending him to other clients. Very decent pricing as well."
Water coming in.
May have a New roof but....
Bad support
gutter
fasica rotten

+48

Response time6 hrs
Recommended by100%of homeowners
Avatar for Scope Environmental
Scope Environmental
5.0(
15
)
Indoor Air Quality TestingMold & Toxic Material TestMold & Toxic Material Test - For Business

Serving Sullivan, MO and surrounding areas

In business since 2023

Free estimates

Small jobs welcome

"I used Scope Environmental recently to test floor tile and the underlying mastic to determine if either contained asbestos. I selected Scope because Jeff was very responsive, professional, independent of the abatement companies and his price was competitive. Jeff suggested testing both the tiles and mastic. The tiles tested positive for asbestos but the mastic contained no asbestos. As a result, I saved considerable expense by abating the tiles only and not the mastic so I also used Scope again for the post abatement air testing rather than the abatement company. I would hire Scope again for material and air testing for asbestos, mold or any other potentially toxic materials."
Black mold inside closet
Mold growth in HVAC Closet
Asbestos Flooring
Floor sample collection
Asbestos Adhesive

+10

Response time4 hrs
Response rate96%
Recommended by73%of homeowners
Nutech Restoration Services, LLC
4.3(
47
)
Indoor Air Quality TestingMold & Toxic Material TestMold & Toxic Material Test - For Business+2 more

Serving Sullivan, MO and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"The best thing about my basement flooding was that Nutech made it very easy to get my basement and house back in order with very little time lost on my end. I would recommend them to anyone and Shawn (sales manager) is one of the best guys to work with in the business. He's honest, hardworking, and very easy to talk to and reach."
 Air Ducts Before
Air Ducts After
Recommended by77%of homeowners
Showing 1-10 of 30
Mold Testing and Remediation FAQs, answered by experts

Turn off the water main immediately. Hire a professional plumber to check on your pipes and make any replacements so you avoid water damage. You don’t want to take any risks with flooding, so it’s best to consult a professional plumber as quickly as possible.

If you’re worried mold might still be lingering after you’ve cleaned your items, here are signs to watch for:

  • Musty smell

  • Visible spots or stains

  • Allergy symptoms when you’re around the item

  • Damp or sticky feel.

If you notice these signs, it might be time to let go of the item or get professional treatment.

Yes. Over time, hidden moisture from a leak in your bathroom may lead to black mold, requiring a mold remediation company’s services and the removal of large wall sections, which can be costly. For example, 100 square feet of drywall can cost as much as $400 to replace, while mold remediation can run anywhere from $500 to $3,000.

Services test for allergens, mold, VOCs, and carbon monoxide levels to ensure a healthy indoor environment.

Dog vomit slime mold is not toxic to humans, plants or pets. However, it can act as an allergen to people with allergies. Dog vomit slime mold is considered more of a cosmetic nuisance. However, it is beneficial to its ecosystem as it helps break down organic matter, releasing nutrients for plants.

The Sullivan, MO homeowners’ guide to mold testing and remediation services

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