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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%
25 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
4 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

Water damage always poses a primary risk of mold and mildew, but growth is not guaranteed. The chances of mold developing depend on several factors, including the severity of the damage and how quickly the area is cleaned and dried. To prevent mold, you must act quickly—ideally within the first 24 hours. Clean up all water and thoroughly dry the affected area. If the damage is extensive, you were unable to address it immediately, or you suspect mold has already started to grow, it is best to assume it is present and hire a professional mold inspector or removal expert to assess the situation.

Mold in a furnace is frequently found on evaporator coils, filters, or within the ductwork. The mold appears in dark, fuzzy patches in either black, green, or white. You may also notice a musty odor. Green or white mold can be cleaned with DIY methods, but if you see black mold, call a professional. Black mold is toxic and harmful to your health.

The easiest way to know if it’s a leak or evaporation that’s causing low water levels in your pool is by conducting the bucket test. However, you can also monitor the chemicals in your pool for signs of imbalances or conduct a visual inspection of the areas around your pool in search of excessive moisture or cracks.

If you believe mold is hidden somewhere in your home, don’t delay inspecting it, as it can be dangerous, especially to people with breathing problems and allergies. While it’s possible to learn how to check for mold yourself, we advise most people to hire a professional mold inspector, who can look more thoroughly. You can also purchase mold test kits if you aren’t sure if your home has mold, but a true human inspector is still your best bet.

Mold thrives in wet or moist conditions, so a fridge water dispenser can be the perfect place for them to live. You may transfer mold to the dispenser's nozzle by touching it with the rim of an unwashed water bottle or your hands. 

If you see splotches that look like mold, you can clean them using vinegar. Distilled white vinegar is acidic enough to kill and remove most mold species.

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.