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

Avatar for ESS Environmental
ESS Environmental
3.8(
8
)
Mold & Toxic Material TestToxicity and Mold - RemovalIndoor Air Quality Testing+2 more

Serving Williston, ND and surrounding areas

Approved

In business since 2017

Free estimates

Small jobs welcome

"We hired Dave to inspect and assess the mold in our home. He is a great man to work with, has years of experience, and is full of knowledge. The inspection provided all the information we needed and I've even contacted him multiple times with somewhat-related follow-up questions. He is a great contact to know when it comes to this area of expertise and I would highly recommend him."
Response time2 days
Response rate90%
24 neighbors recently requested a quote
Avatar for Montana Basement Solutions
Montana Basement Solutions
4.6(
7
)
Mold & Toxic Material TestMold & Toxic Material Test - For BusinessToxicity and Mold - Removal - For Business

Serving Williston, ND and surrounding areas

In business since 2007

Free estimates

Emergency services offered

"I called Montana Basement Solutions when we discovered mold in our basement. We were stressed and worried about the safety of our children in the home. When I called, the receptionist quickly put me in touch with Rich, who talked me through the process and helped give me information about what I could do prior to having someone come out. He set up a time when one of the guys would be close to town and waved the travel fee since he would be in this area anyway. He was kind, knowledgable and made me feel like he really wanted to help us. Wynn came out a few days later and gave us tons of information. He walked us through what we needed to do and was willing to spend an exorbitant amount of time, late into the evening, prior to a long drive home, explaining everything we needed to know about our problem. He addressed every one of our concerns and answered all of our questions in depth. He was friendly, knowledgable and professional. I would highly recommend this company. From the very first phone call, I have been so pleased with the customer service I have received. I had called 4 other companies prior to and after talking with Montana Basement Solutions, 2 who said they would come out two days later ( never heard from them) and 1 that still has not called back (and I have left 2 messages). I am so grateful for the time Wynn gave to us and did I mention , he did all of this free of charge? He also gave me the answer to my problem and it did not require me using their services. If you have a mold problem, I would start with Montana Basement Solutions."
 Extra attention to tie holes and cracked areas
 A clean, dry, & healthy crawlspace in your home!
 Our emulsion stretches up to 1800% - it works!
 Before & After - Crawlspace Ensulation
 Grey trim color gives a clean look to your home.

+2

Recommended by100%of homeowners
Avatar for American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,689
)
Dry-rot, Water or Pest Damage - Major Repair

Serving Williston, ND and surrounding areas

In business since 1971

Credit card accepted

"AHS is ok. They cover repairs of most everything under the roof of your house. The companies that contract with them are not always the best. You call AHS with the issue, they send a fax to the repair company and give you the contact info. If they don't contact you within 24 hours, you call them. Sometimes they answer, sometimes they don't. When they arrive (usually three days or so later), they service the item. if it has issues within the 90 days, you call AHS again, they are sent out with no charge. If the serviceman decides the unit is unrepairable, AHS will allow you to choose a replacement from their listing (usually not as good as what you have) they will install and remove your old item, or give you wholesale amount to buy and install your own. Prices vary on what you want covered and what you want the copay to be, plus where you live. For me it is 49.99 per month with a 75.00 time of service order. You can have more than one item serviced at the same time under the same fee. If you have a SEAR product the repair guys are great. Not that wild about the other ones they send out. But it is a big savings compared to calling someone on your own. The cost of service is only the 75.00 copay."
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+2

Recommended by65%of homeowners
Avatar for Midwest Mold Inspection
Midwest Mold Inspection
New to Angi
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Williston, ND and surrounding areas

In business since 2024

Free estimates

Small jobs welcome

We are the mold experts of ND. Offering mold inspections, mold testing, and air sampling for residential and commercial properties. We are Professional Mold Inspection Institute certified.\n\nMidwest Mold Inspection is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business.

Response time6 hrs
5 neighbors recently requested a quote
Avatar for Land Shark Services, LLC
Land Shark Services, LLC
5.0(
2
)
Indoor Air Quality Testing

Serving Williston, ND and surrounding areas

In business since 2016

Free estimates

Credit card accepted

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

Response time3 hrs
Avatar for SGS-Hale Grounding
SGS-Hale Grounding
2.0(
1
)
Indoor Air Quality TestingMold & Toxic Material TestMold & Toxic Material Test - For Business+2 more

Serving Williston, ND and surrounding areas

In business since 2021

Free estimates

Warranties offered

We are committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests, and make their concerns the basis of our business. \n

My Work
My Work
My Work
My Work
My Work

+2

Response time5 hrs
Avatar for Northern Property Restoration
Northern Property Restoration
New to Angi
Dry-rot, Water or Pest Damage - Major Repair

Serving Williston, ND and surrounding areas

In business since 2003

Free estimates

Small jobs welcome

\nWe are a licensed construction contractor specializing in the renovation or remodel of preexisting homes. We can handle many aspects of home renovation from simple floor refinishing to kitchen remodels and major structural repairs. We also build custom aquariums, decks/ patios and wooden greenhouses. Our free certified estimates guarantee no surprise costs and with 10+ years experience in the home renovation industry you can ensure the job is done right.

Response time1 day
Mold Testing and Remediation FAQs, answered by experts

Mold can grow anywhere in a home where moisture accumulates and doesn't dry out, particularly in areas with poor ventilation. Common materials affected include insulation and drywall. The most frequent locations for mold growth are attics, basements, crawl spaces, wall cavities, bathroom and kitchen walls, exposed foundations, windows and window sills, air conditioning and heating vents, and around fireplaces and chimneys.

It is generally not safe to live in a house with smoke damage, as even minor damage can pose long-term health hazards and structural risks. While it might seem safe temporarily depending on the severity, you should relocate if there is major damage or visible soot. Smoke smells and residue contain dangerous particulates and chemical compounds, including carcinogens, that are hazardous to breathe and can cause respiratory issues. These signs of damage are not always visible but can have dangerous short-term and long-term effects on your health, belongings, and your home's structural materials. You should not stay in the house until a trained professional from a smoke remediation or restoration company has assessed the damage and determined it is safe to return. Your insurance company may cover the cost of alternative housing while the professional work is completed.

The answer to whether it’s safe to use a moldy dishwasher is: It depends. Mold exposure affects people differently. It’s possible that even a small amount of mold in your dishwasher could contribute to respiratory issues and other health problems, especially if you have an underlying health condition. Mold is capable of surviving the high heat and detergent used in a dishwasher cycle, so it’s important to ensure that you act quickly at the first sign of mold, or contact a house cleaner near you to stay on top of any potential mold problems.

If you’re unsure whether you have mildew or mold, you can hire a professional to test the material. The mold inspection cost can range from about $300 to $1,000, depending on the size of the growth area. Once the testing professional tells you whether you have mold or mildew, you can then take the necessary steps to get rid of it.

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.

The Williston, ND 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.