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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 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

"David, at Gardner Environmental Services, professionally performed numerous air sample tests inside our home due to a minor smelling of mold in one spot.Fortunately, his lab resource came back with negative results on each location sample David tested. David was reassuring and pleasant to work with. I would recommend his company, to anyone."
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!"
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+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

Mold loves a moist environment, so the best way to keep it from returning is to keep your machine as dry as possible. Take laundry out of the machine as soon as you can after a cycle finishes. If your laundry room is humid, consider using a dehumidifier or at least running a fan to increase airflow.

It's also a good idea to leave the washing machine door open when it's not in use, to improve airflow and keep the interior dry.

Yes, if there is mold in your drywall mud and you then use it to build walls in your house—or if mold develops in your set drywall, like it can in hot and humid areas—it can lead to illness. Mold in your drywall (or other parts of your home) can make existing respiratory conditions or allergies worse, and the effect can be more intense for those who have existing health issues or compromised immune systems.

Water damage doesn’t always cause mold and wood rot, but it can. Both mold and wood rot require moisture in the wood to form, so water damage that continues to leave water or moisture behind can lead to both issues. Water damage and mold often go hand-in-hand, but you can prevent mold growth after water damage by addressing the source of moisture and drying out the area quickly. The same goes for wood rot. The longer you let water damage go, the higher the risk of mold and rot.

Some causes of brown well water—like excess tannins or dissolved iron—don’t pose a health risk. In other cases, harmful bacteria might be the culprit. If your well water has suddenly turned brown, it’s a good idea to use a home water test kit to get a better sense of what’s going on with your water. Consider calling a professional for an expert opinion before drinking the water and hoping for the best.

A stain from a water leak will usually be brown and concentrated in a single area where the water is originating from. You may find it under a damaged section of roof, under an upstairs bathroom, or beneath your HVAC system. Stains from condensation are more likely to be widespread since they don’t come from a single point of water intrusion. Condensation stains also look blotchy and may smell musty, and they won’t be concentrated in a single area on your ceiling.

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.