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

Avatar for Mold Inspection Sciences of Seattle
Mold Inspection Sciences of Seattle
4.8(
30
)
Mold & Toxic Material Test

Serving Startup, WA and surrounding areas

Approved

In business since 2002

Free estimates

Small jobs welcome

"

Gerry arrived on time and was very personable. He said he would look in every nook and cranny including cupboards, etc. After his inspection he showed me his findings and explained about taking samples and asked permission for the air samples, as they were $100.00 each. I agreed to all procedures and costs because I felt it was important to know everything. The report was e-mailed to me on the 3rd day as promised and it was very scientific with pictures and readings and all kinds of information. They called to let me know it was done and I appreciated that. I needed to call a few times afterwards with questions and they were always there. The secretary was especially nice because she listened to my concerns regarding some one I hired whom I didn't think was getting the job done right., and also because it was someone they recommended for me because I asked them to give me recommendations.

After receiving the report, and before and after hiring their recommended company, I began looking at the surrounding areas and found more items which had mold. All of my findings were in the very rooms that had been inspected. I found mold on furnishings in our basement main room, which was not included or noted in the report. It has also since been found in our garage..........I felt sure he had looked in the garage because I saw him enter the house from the garage door at one point when I went downstairs to see if he needed anything. This mold is mostly in the insulation on the garage ceiling and some surrounding wood which was found by a home inspector I hired. ..This inspector also found that the wood floors in both bedrooms above the garage showed higher than normal humidity readings and the entire basement flooring is at a 16% reading. ( that would explain the mold found on the furniture) I am so disappointed. I feel I paid 399.00 for someone to find half the mold. I thought I was hiring experts and could rest assured that every room had been thoroughly looked at. I can only assume that checking the flooring for moisture during a mold inspection is optional.

If anyone out there is going to have this kind of inspection I highly recommend staying with the person and really looking at everything because you know your home best, making sure you and the inspector have looked at every possible place for your own peace of mind. I was worried and thought I might be in the way. There was a lot of stuff in all the rooms, however I did offer to move anything to help him get through his inspection. He never asked and I assumed all was well. I'd like also to mention that in the report, after each description of the separate findings, the statement is made that "hidden mold is possible". I learned that getting a thorough inspection is really not possible.

"
Air Pump
PPE
Attic inspection
qPCR Sample
Infrared camera

+3

Response time2 days
Response rate100%
Recommended by92%of homeowners
Avatar for 5 Microns Inc.
5 Microns Inc.
4.9(
74
)
Indoor Air Quality TestingMold & Toxic Material Test

Serving Startup, WA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"I have only good things to say. Pascal was super responsive, professional, explained the mold testing process and what kind of air samples he recommended. The results were ready within 2 days, along with a detailed lab report and an explanation of the report that was easily understandable. I would highly recommend this company to anyone looking for professional testing of mold and other contaminants."
Vinyl sheeting asbestos test
Wall asbestos test
Asbestos air test
Mold and moisture testing
Mold air test

+32

Response time3 hrs
Response rate98%
Recommended by100%of homeowners
Avatar for Mold Test Company WA
Mold Test Company WA
3.8(
80
)
Mold & Toxic Material TestIndoor Air Quality TestingMold & Toxic Material Test - For Business

Serving Startup, WA and surrounding areas

Approved

In business since 2008

Emergency services offered

Small jobs welcome

"Mold testing was thorough but do not let them sell you on their remediation do-it-yourself kit without knowing exactly what you are paying for. The kit is non-refundable and sold by a separate company. They do not tell you that. They transfer you to who you think is another employee to advise about remediation and they are actually transferring you to a completely different company. I was very disappointed when I learned all that. That company does not send out an itemized list of what you paid for unless you ask for it. It has been four days and after spending close to two thousand dollars I have yet to know what I bought."
Mold Testing
Mold Testing
Mold Testing
Mold Testing
Mold Testing

+70

Response time2 days
46 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for Insulation Co., LLC - Removal & Clean Outs
Insulation Co., LLC - Removal & Clean Outs
4.9(
226
)
Toxicity and Mold - RemovalToxicity and Mold - Removal - For Business

Serving Startup, WA and surrounding areas

Approved

In business since 2009

Free estimates

Warranties offered

"Fantastic company and an even better work crew. They did a complete mold remediation of our crawlspace. Removed existing insulation, did mold remediation, installed new insulation and insulated all of our duct work and replaced vapor barrier. Workers were professional throughout the entire process. Thanks Jo, will definitely recommend!!"
1
2
3
1
2

+46

Response time5 hrs
Recommended by49%of homeowners
Avatar for Restoration Pro, LLC
Restoration Pro, LLC
5.0(
8
)
Toxicity and Mold - RemovalToxicity and Mold - Removal - For Business

Serving Startup, WA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"I hired Restoration Pro to remove the mold from my attic and they did an excellent job! The results were much better than I expected. The team is very professional, and I would definitely hire them again. I highly recommend them 100%!"
Berger Mold Remediation
Berger Mold Remediation
Berger Mold Remediation
Berger Mold Remediation
Berger Mold Remediation

+96

Response time4 hrs
Response rate86%
8 neighbors recently requested a quote
Avatar for Waterline Restoration
Waterline Restoration
5.0(
12
)
Mold & Toxic Material TestToxicity and Mold - Removal

Serving Startup, WA and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"We hired WATERLINE RESTORATION LLC to restore our bathroom after discovering Black Mold under the tile, ceiling to floor. From start to finish Viktor and Petro exceeded ALL expectations. We were extremely impressed by their knowledge of the process, their efficiency and attention to detail, their professionalism, and their respect shown to us by taking time to answer our questions thoroughly and clearly, and our home by cleaning up the area. In 2 days, they completed the project and disposed of the waste properly and safely. We can't thank them enough and would highly recommend them to anyone in need of their services."
Avatar for Mold Dog Company
Mold Dog Company
4.3(
4
)
Mold & Toxic Material Test

Serving Startup, WA and surrounding areas

Approved

In business since 2020

Small jobs welcome

Credit card accepted

"I have lathe and plaster walls so having the option to have a dog come and smell was the best for us. Corinna and her dog Catalina were very professional (I have 2dogs of my own which we put outside). Catalina and Corinna are very professional pair I would highly recommend them to check for mold if your in need of this type of service. We do have mold and will be dealing with that issue. Mold is an issue in western Washington. I have been sneezing multiple times in a row when I sneeze for a few years and found out that is a mold related issue."
Response time1 day
Response rate94%
3 neighbors recently requested a quote
Avatar for Grey Wolfe Construction, Inc.
Grey Wolfe Construction, Inc.
4.8(
39
)
Dry-rot, Water or Pest Damage - Major Repair

Serving Startup, WA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"The project took about three weeks and involved digging a new French drain and waterproofing our foundation walls and footer. The work was completed carefully and professionally. The labor was done with attention to neatness and detail. We are very happy with the results. We also had our basement carpet replace with moisture retardant tile pads and tile."
Kitchen
From Hallway
Finished
Finished
Response time1 day
Response rate99%
9 neighbors recently requested a quote
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Mold Testing and Remediation FAQs, answered by experts

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 most common reason for a smelly dishwasher is a dirty dishwasher filter. The filter is responsible for catching food while your machine is running to prevent clogs. Over time, that filter gets more and more filled with food particles. Cleaning your dishwasher filter monthly can keep the smell at bay.

Black discoloration on your attic insulation may be caused by buildup from soot, dust, or dirt, which does not come with dampness or a musty odor. However, another cause of black discoloration on attic insulation is black mold, which has a musty smell and other signs of damage. If you’re unsure what black stuff you’re looking at, consult a pro to be safe.

According to the EPA, mold grows within 24 to 48 hours if left untreated after a water leak. So unless you notice the leak and stop it right away, you only have a day or so before mold is a real concern. If you don’t notice the leak, it can take about three weeks for the mold spores to become visible. That means you’ve likely had an active mold infection for a few weeks by the time you notice discoloration.

Mold in your air conditioner isn't a good thing, as it can be harmful to your health. If the mold travels through the ductwork or is blown out of the A/C, you and your family can inhale mold spores and develop respiratory illnesses and other problems. Preventing mold from growing in the air conditioner will help protect your health.

The Startup, WA 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.