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  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon40
    Verified mold testing and remediation services reviews

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

Avatar for Green Home Solutions - Chicago West Suburbs
Green Home Solutions - Chicago West Suburbs
4.9(
34
)
Indoor Air Quality TestingMold & Toxic Material TestMold & Toxic Material Test - For Business

Serving Johnsburg, IL and surrounding areas

Approved

In business since 2020

Emergency services offered

Warranties offered

"I would be remiss if I didn't take the time to write a review for Green Home Solutions. I was in a total quandary when I spotted black mold on a baseboard in one of our bedrooms. I knew immediately that we had to have this checked out since my wife uses that room a lot when I snore. Not knowing who to call, I went on a neighborhood website and found the info for Green Home. I immediately called and was in touch with Autumn and then Jim within one hour. We set up a testing meeting and Jim was there at the exact time and was ready to go. After some pleasantries (and he is a friendly guy) he got to work checking out our entire home and that bedroom in particular. He used very high-tech equipment and pinpointed the spot with the mold. We determined that the window on that wall had rotted seals and was surely the source of water getting in. Jim left and within 2 days I had the complete report of what he found and a detailed report on the remediation. I quickly okayed the project and we had a date the next week for work to begin. Again, Jim and his assistant were right on time and set everything up to begin the remediation process. Let me add, at this point, that they set everything up to cause the least amount of mess and dust to any other part of the house. They got to work and within that day had the wall out and identified the mold and its source. They also found some mold in the attic and identified those sources as defective vents from bathrooms. Jimâ s friend Dean, a roofer, identified those problems and will be remediating those issues. After the entire process of removal was over I still had some questions and Jim came out again the next day with a new HEPA unit and helped me clean dust from the room. A week later his wife, Autumn, was out to do a final check of mold levels in the bedroom and attic. We are now in the clear (no pun intended). Being a senior citizen I deal with a lot of home repair people and Jim Blandi is one of the best, nicest and most professional company owners you will deal with. GHS gets my 100% endorsement. Jim Sims"
Damage wood floors with mold
Crawlspace Encapsulation
Work Fleet
Work Fleet
Work Fleet

+16

Response time3 hrs
Response rate95%
Recommended by90%of homeowners
Avatar for Gardner Services
Gardner Services
4.7(
17
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business+2 more

Serving Johnsburg, IL and surrounding areas

Approved

In business since 1996

Free estimates

Emergency services offered

"This company is great to work with. They did some mold testing on parents’ home and did excellent work. They also did some work on my home. They replaced a water heater and bathroom fans. He was easy to get a hold of, personable and come over right away."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+18

Response time7 hrs
Response rate100%
8 neighbors recently requested a quote
Avatar for LaFrance Environmental
LaFrance Environmental
5.0(
7
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Johnsburg, IL and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

"I had Brett come to our home to test for mold because I’ve had an ongoing illness that Drs can never diagnose. He was so caring & did the testing within days of talking to him the 1st time. After the testing, he explained everything in detail and provided a list of things to improve the air quality in the home. I have never dealt with any type of contractor that was as thorough and really had our best interest at heart. He was honest, upfront with cost and I felt like I could totally trust him and his recommendations. If you are in need of mold or air quality testing, call Brett. You will be completely satisfied with his knowledge and care to make your home “healthy” again."
Mold and Basement Leak
Mold and Basement Leak
Mold and Basement Leak
Response time5 hrs
Response rate100%
22 neighbors recently requested a quote
Avatar for Emerald Build Group
Emerald Build Group
5.0(
7
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business+2 more

Serving Johnsburg, IL and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Warranties offered

"I am extremely satisfied with the mold inspection and remediation services! The team conducted a thorough inspection of the entire property, used professional equipment to measure moisture levels, and clearly explained where the issues were located. After we agreed on the scope of work, they promptly began the remediation process: everything was done carefully, using safe products, and they provided a detailed report with before-and-after photos. The entire process was smooth, on schedule, and stress-free. I especially want to highlight their high level of professionalism, attention to detail, and willingness to answer all my questions. Now the air in my home is fresh again, with no unpleasant odors. I highly recommend this company to anyone looking for reliable mold specialists!"
After Photos Condo
After Photos Condo
After Photos Condo
After Photos Condo
After Photos Condo

+68

Response time2 hrs
Response rate100%
1 neighbors recently requested a quote
Avatar for Gardner Environmental Services
Gardner Environmental Services
4.8(
265
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Johnsburg, IL and surrounding areas

Approved

Super Service Award Winner

In business since 1993

Free estimates

Emergency services offered

"Arrived on time and explained everything to me about the testing and possibilities. We ended up not having any mold (yay) and David called me with my results, explaining other possibilities for the smell we have been experiencing. It was a great experience!"
Untitled Gallery 1
Untitled Gallery 1
Untitled Gallery 1
Untitled Gallery 1
Untitled Gallery 1

+20

Response time5 hrs
16 neighbors recently requested a quote
Recommended by90%of homeowners
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Mold Testing and Remediation FAQs, answered by experts

Excessive humidity in a room often manifests through visible signs like condensation on windows or walls, a musty or damp odor lingering in the air, peeling wallpaper or paint, and the presence of mold or mildew. Experiencing discomfort due to a consistently clammy or sticky feeling can also indicate high humidity levels.

Unfortunately, mold can grow pretty much anywhere, on any kind of surface. However, you’re most likely to see it in damp areas like basements or bathrooms, as well as anywhere there has been a water leak. Consult a local mold specialist to determine if certain areas of your home are prone to mold based on climate and other factors.

While a professional can always help, there are some common plumbing culprits you can check yourself to see if you can find the sewer gas smell. For example, you should check your water traps, sometimes called P-traps and S-traps, which are located under sink, shower, and laundry drains. The wax ring beneath the base of your toilet, which creates a watertight seal with the plumbing, could also have gone bad.

Yes, mold in the basement of your home will affect the conditions upstairs. Mold spores can travel through the air and into the supply vents of your home’s ventilation system. It is extremely important to remove any mold in your basement as soon as possible so it doesn’t affect the health of those living in the house.

Mold in a basement is harmful as it can trigger allergy symptoms, especially for those with asthma and other breathing conditions. Symptoms of mold exposure include itching, sneezing, running nose, and congestion.

The Johnsburg, IL 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.