iHow the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 55%96+52.4Reliability 24%95+23Value 14%97+13.7Replies to reviews 7%82+5.8Experts Score= 95Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.95SCORE
AGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#29 of 61 mold inspectorsiPosition by Experts Score among all companies we track in this category. · better than 53%
5.0★★★★★327 Google reviews · 16 photos
98%five-star reviews
4.94★last 12 monthsiAverage stars on reviews from the last 12 months only.
0.6%1–2★ in 2 yearsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
Customers consistently praise the company for thorough mold inspections, punctual appointments, and detailed reporting on air quality issues. Reviewers highlight clear communication, knowledgeable staff, and efficient scheduling as key aspects of the service. However, a small number of low-star reviews criticize the pre-inspection communication for being vague and lacking direct phone contact, despite the overall high satisfaction with the final testing results.
Google rating: 5.0 out of 5 from 327 reviews (98% five-star).
Reviews on this page: 327 Google reviews (307 with written comments, 1 with photos).
Owner responses: the business replied to 79% of reviews.
Most recent review: October 16, 2026.
Service: Mold Inspector serving Tigard, Oregon.
Data from Google, last updated October 26, 2026.
Score profile vs other mold inspectors
Score per factor (100 = best)iEach factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: craft & service and momentum; weakest: replies to reviews.
This companyMold Inspectors median0 = centre, 100 = best
SatisfactioniSatisfaction · 54% of the scoreRecency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.Mold Testing Services of Oregon: 96/100 on this factor. Category median: 96.A
96
ReliabilityiReliability · 24% of the scoreHow rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.Mold Testing Services of Oregon: 95/100 on this factor. Category median: 95.A
95
Craft & serviceiCraft & service · penalty only, up to −10 pointsGoogle review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Mold Testing Services of Oregon: 100/100 on this factor. Category median: 99.A
100
ValueiValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Mold Testing Services of Oregon: 97/100 on this factor. Category median: 100.A
97
MomentumiMomentum · penalty only, up to −10 pointsPenalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.Mold Testing Services of Oregon: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsiReplies to reviews · 7% of the scoreHow often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.Mold Testing Services of Oregon: 82/100 on this factor. Category median: 75.A
82
Bar = this company · dark tick = category median.
Star ratings
327 Google reviews we collected
5.0of 5
5 stars32298%
4 stars21%
3 stars00%
2 stars00%
1 star31%
Praise vs complaints
Phrases our text analysis found in 307 written reviews
99%praise
Praise87099%
Complaints71%
PriceiGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.
Price verdicts customers left with their Google review
100%fair
Great price311%
Reasonable2281%
Overpriced00%
Not sure27%
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude20423%
Quality & results17920%
Speed & response15518%
Would recommend15217%
Communication10512%
Honesty & trust465%
Price & value364%
What customers talk about
We read 307 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Garrett was respectful, friendly, and very thorough.”
“Great experience from very first contact to receiving the final results.”
“He promptly answered all my questions and concerns.”
“Absolutely recommended for anyone that wants to know for sure the mold status on the house.”
“I recently hired Garrett to conduct a mold inspection on my home, and I cannot recommend him highly enough.”
“Garrett was punctual and help explain the sampling and testing process.”
“He was straightforward and transparent throughout the process, and I always felt like I was getting an honest assessment and clear information.”
“The prices were reasonable and he did not try to upsale us on anything.”
People customers mention
Garrett110 reviews
Dayfield11 reviews
Garret8 reviews
Portland5 reviews
Oswego3 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Mold Testing Services of Oregon for 1 kind of job. Pick one to see what they paid and said.
Francisco7 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a week ago★★★★★
Had a fantastic experience with this company. Garret is very knowledgeable. He promptly answered all my questions and concerns. His testing and sample collection was extremely thorough and punctual. I was very impressed with the reports provided. Absolutely recommended for anyone that wants to know for sure the mold…
Reasonable priceEnvironmental due diligence
Margaret1 reviewiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 weeks ago★★★★★
Worked with Garrett on having my living area and crawl space tested for mold. Garrett was punctual and help explain the sampling and testing process. He was available to answer follow up phone calls to review test results.
K11 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 weeks ago★★★★★
Great experience from very first contact to receiving the final results. Garrett was phenomenal at communication, attention to detail, and incredibly skilled in mold detection and analysis. The whole process was painless and efficient. Highly recommend!
Reasonable priceEnvironmental due diligence
Daniel3 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 3 weeks ago★★★★★
I had a great experience with MTSO Mold Testing, and I especially want to recognize Garrett Dayfield, who was our technician.
Garrett was respectful, friendly, and very thorough. He took his time with the inspection and talked me through what he was seeing, which I really appreciated. He was straightforward and…
Leslie10 reviewsiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★★★★★
Garrett Dayfield of Mold Testing Services of Oregon, LLC did an excellent job of assessing my house, inside and out, with ample pictures, thorough descriptions, and suggestions for addressing problems with mold and other air quality issues. Use this service earlier rather than later. Mold is dangerous!
Reasonable priceEnvironmental due diligence
Robert1 reviewiTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · Edited a month ago★★★★★
Garrett with Mold Testing Services was very helpful, fast and efficient after we had a water
leak vehind the wall that turned out to be moldy. I wiah everyone was as clear and professional as he is!
Had a fantastic experience with this company. Garret is very knowledgeable. He promptly answered all my questions and concerns. His testing and sample collection was extremely thorough and punctual. I was very impressed with the reports provided. Absolutely recommended for anyone that wants to know for sure the mold status on the house. I would not hesitate to use again and recommend to friends and family. Worth every penny!
Price assessment: Reasonable price
Services: Environmental due diligence
Response from the owner · a week ago
Francisco, thank you for the glowing review. We’re delighted Garret’s knowledge, punctual testing, and clear answers gave you confidence in your home’s mold status. Your recommendation means a great deal, and we look forward to assisting you or anyone you refer in the future.
Margaret Baumgartner1 reviewiTotal number of Google reviews Margaret has written across all businesses on Google Maps, not just this one.
Worked with Garrett on having my living area and crawl space tested for mold. Garrett was punctual and help explain the sampling and testing process. He was available to answer follow up phone calls to review test results.
Response from the owner · a week ago
Margaret, thanks for the kind review. We’re glad Garrett was punctual, explained the sampling and testing clearly, and remained available to review results with you. Hearing this reassures our team that timely communication matters. We appreciate your trust and are here if you need anything in the future.
Jonah Edelman8 reviewsiTotal number of Google reviews Jonah has written across all businesses on Google Maps, not just this one.
Jonah, thank you for the great review. We’re pleased to hear our responsiveness and efficiency stood out, and we truly appreciate your recommendation. It means a lot to our team. We look forward to assisting you again.
K M11 reviewsiTotal number of Google reviews K has written across all businesses on Google Maps, not just this one.
Great experience from very first contact to receiving the final results. Garrett was phenomenal at communication, attention to detail, and incredibly skilled in mold detection and analysis. The whole process was painless and efficient. Highly recommend!
Price assessment: Reasonable price
Services: Environmental due diligence
Response from the owner · 2 weeks ago
We really appreciate you sharing this, K M. We're thrilled Garrett's clear communication, meticulous eye, and quick turnaround made the process smooth and painless. Hearing the final results met your expectations means a lot. We look forward to assisting you again whenever needed.
Daniel Jones3 reviewsiTotal number of Google reviews Daniel has written across all businesses on Google Maps, not just this one.
I had a great experience with MTSO Mold Testing, and I especially want to recognize Garrett Dayfield, who was our technician.
Garrett was respectful, friendly, and very thorough. He took his time with the inspection and talked me through what he was seeing, which I really appreciated. He was straightforward and transparent throughout the process, and I always felt like I was getting an honest assessment and clear information.
He was also very prompt, and we received our report and results quickly. The recommendations for contractors and next steps were really helpful and gave us a good place to start.
Overall, I really appreciated how easy Garrett made the process. Mold can be a stressful thing to deal with, and I felt like we were in good hands. I would definitely recommend MTSO Mold Testing.
Response from the owner · 3 weeks ago
Thank you, Daniel. We’re so glad Garrett’s respectful, thorough approach and clear explanations helped make the process easier and that the report and recommendations were useful. Your recommendation truly encourages our team. We’re here if you need further assistance.
Leslie Dobbertin10 reviewsiTotal number of Google reviews Leslie has written across all businesses on Google Maps, not just this one.
Garrett Dayfield of Mold Testing Services of Oregon, LLC did an excellent job of assessing my house, inside and out, with ample pictures, thorough descriptions, and suggestions for addressing problems with mold and other air quality issues. Use this service earlier rather than later. Mold is dangerous!
Price assessment: Reasonable price
Services: Environmental due diligence
Response from the owner · 4 weeks ago
Thank you, Leslie. We’re glad Garrett’s thorough assessment, clear photos, and practical suggestions were helpful. Your reminder to act early on mold is important. We appreciate your trust and are here if you need further assistance.
Robert Mackey1 reviewiTotal number of Google reviews Robert has written across all businesses on Google Maps, not just this one.
Garrett with Mold Testing Services was very helpful, fast and efficient after we had a water
leak vehind the wall that turned out to be moldy. I wiah everyone was as clear and professional as he is!
Services: Environmental due diligence
Response from the owner · 4 months ago
Thank you for the 5-star rating, Robert — we really appreciate it. We're delighted you had a great experience and look forward to serving you again. If you ever need anything, feel free to reach out.
Carrie McMullin3 reviewsiTotal number of Google reviews Carrie has written across all businesses on Google Maps, not just this one.
Garret was very professional and supplied a very detailed report that is helping us know how to move forward with needed fixes.
Response from the owner · a month ago
Thanks for sharing, Carrie. We appreciate hearing that Garret's professionalism and thorough report are helping you determine next steps. Your kind words motivate our team. We look forward to supporting you if you need anything else.
Robert Cole1 reviewiTotal number of Google reviews Robert has written across all businesses on Google Maps, not just this one.
Garrett did a wonderful job on his visit. Incredibly thorough and professional. He explained each step of the process and spent the time answering all our questions. Just a very positive experience all around. Would completely recommend his service to others!
Response from the owner · a month ago
Robert, thank you for the wonderful feedback. We are thrilled Garrett was thorough, professional, and took the time to explain everything. Your recommendation means a great deal to our team. We look forward to helping again if you need us.
Christopher McHenryLocal Guide · 30 reviewsiTotal number of Google reviews Christopher has written across all businesses on Google Maps, not just this one.
The owner Garrett was very thorough in his evaluation of our home for mold. He was very knowledgeable and gave us good recommendations on what to do to address issues in our home. I would definitely recommend his services.
Response from the owner · a month ago
Thank you, Christopher. We are glad Garrett’s thorough evaluation and clear recommendations helped you address the issues in your home. We appreciate your recommendation and your trust in our services. Please reach out if we can assist further.
