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%98+53.5Reliability 24%96+23.3Value 14%100+14.1Replies to reviews 7%56+4Experts 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.
#26 of 56 radon testing servicesiPosition by Experts Score among all companies we track in this category. · better than 55%
5.0★★★★★324 Google reviews · 1 photos
99%five-star reviews
4.97★last 12 monthsiAverage stars on reviews from the last 12 months only.
0.7%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.
Google reviewers rate Great Lakes Radon five stars based on 324 reviews, noting the owner replies to 98% of feedback. Customers primarily describe radon mitigation system and sump pump installations, highlighting punctual arrivals, clear communication, professional conduct, and adherence to quoted prices. Many mention efficient service, often completing work within two hours, and effective post-installation radon level reduction. The provided excerpts contain no low-star reviews or recurring criticisms.
Google rating: 5.0 out of 5 from 324 reviews (99% five-star).
Reviews on this page: 324 Google reviews (292 with written comments, 28 with photos).
Owner responses: the business replied to 98% of reviews.
Most recent review: October 14, 2026.
Service: Radon Testing Service serving Detroit, Michigan.
Data from Google, last updated October 27, 2026.
Score profile vs other radon testing services
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: value and momentum; weakest: replies to reviews.
Great Lakes RadonRadon Testing Services 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.Great Lakes Radon: 98/100 on this factor. Category median: 95.A
98
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.Great Lakes Radon: 96/100 on this factor. Category median: 95.A
96
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.Not enough reviews for this factor yet. Category median: 98.–
–
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.Great Lakes Radon: 100/100 on this factor. Category median: 100.A
100
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.Great Lakes Radon: 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.Great Lakes Radon: 56/100 on this factor. Category median: 82.C
56
Bar = this company · dark tick = category median.
Star ratings
324 Google reviews we collected
5.0of 5
5 stars32199%
4 stars21%
3 stars00%
2 stars10%
1 star00%
Praise vs complaints
Phrases our text analysis found in 292 written reviews
100%praise
Praise744100%
Complaints30%
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 price1940%
Reasonable2757%
Overpriced00%
Not sure12%
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude17323%
Speed & response16622%
Would recommend13017%
Quality & results10915%
Communication9012%
Price & value628%
Honesty & trust172%
What customers talk about
We read 292 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“Job was done very professionally and I was charged what I was originally quoted.”
“Timely, professional, reasonably priced and efficient!”
“They did a fantastic job and I would definitely recommend them.”
“We loved Dane and can't recommend enough.”
“We had a really great experience with Great Lakes Radon.”
“The team who installed our system were very professional, answered our questions, and our mitigation system is working perfectly.”
“He was able to get us scheduled quickly at a very fair price.”
“You can tell he genuinely cares about his work and his customers.”
People customers mention
Dane38 reviews
Logan12 reviews
Dalton5 reviews
John4 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Great Lakes Radon for 3 kinds of job. Pick one to see what they paid and said.
JanetLocal Guide · 12 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 Lakes Radon did work for several of our neighbors. They were very happy with the results. So were WE! Appointment was easily scheduled. They communicate effectively prior to arrival. Job was done very professionally and I was charged what I was originally quoted. They are proud of the work they do and are…
Great priceService not listed
IanLocal Guide · 20 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★★★★★
Great experience working with Great Lakes Radon. Fast, professional service. They did business the way business should be done - no catches, no surprises, guarantees on good workmanship. Made it really easy for the customer. Highly recommend. Shout out Will and Dane
Reasonable price
Erika5 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★★★★★
Great job. Quick and clear explanation. They installed a Radon gas mitigation system.
Reasonable priceService not listed
Braden10 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★★★★★
We had a really great experience with Great Lakes Radon. Our installation was a little tricky because of the landscaping and trees around our home, but Dane and his team took the time to figure out the best way to do it without compromising the look of our house and yard. Dane was very involved and went out of his…
BEN2 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 months ago★★★★★
Installed radon mitigation. Arrived for the appointment on time. Communicated the work to be completed. Courteous & professional. Would recommend!
Reasonable priceService not listed
DavidLocal Guide · 10 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 months ago★★★★★
Great professional team, accommodated to basement restrictions, and cleaned up after the work. Levels dropped to under 1 after the first day
Great Lakes Radon did work for several of our neighbors. They were very happy with the results. So were WE! Appointment was easily scheduled. They communicate effectively prior to arrival. Job was done very professionally and I was charged what I was originally quoted. They are proud of the work they do and are committed to keeping their sterling reputation.
Price assessment: Great price
Services: Service not listed
Response from the owner · 2 weeks ago
Thank you for the wonderful review, Janet! We're thrilled to hear that you and your neighbors had such a great experience with our radon mitigation team. We truly appreciate your business and kind words!
Ian HouseLocal Guide · 20 reviewsiTotal number of Google reviews Ian has written across all businesses on Google Maps, not just this one.
Great experience working with Great Lakes Radon. Fast, professional service. They did business the way business should be done - no catches, no surprises, guarantees on good workmanship. Made it really easy for the customer. Highly recommend. Shout out Will and Dane
Price assessment: Reasonable price
Response from the owner · a month ago
Thank you so much for the review, Ian! We really appreciate the feedback and will be sure to pass your shout-out along to Will and Dane. Thanks for choosing Great Lakes Radon!
Erika Sánchez5 reviewsiTotal number of Google reviews Erika has written across all businesses on Google Maps, not just this one.
We had a really great experience with Great Lakes Radon. Our installation was a little tricky because of the landscaping and trees around our home, but Dane and his team took the time to figure out the best way to do it without compromising the look of our house and yard. Dane was very involved and went out of his way to make sure everything turned out the way we wanted. We really appreciated the extra effort and attention to detail. You can tell he genuinely cares about his work and his customers. They did a fantastic job and I would definitely recommend them.
Response from the owner · a month ago
Thank you so much for the review, Braden! We're so glad Dane and the team were able to work around your landscaping to get the job done right. We truly appreciate your recommendation and your business!
BEN CHAFIN2 reviewsiTotal number of Google reviews BEN has written across all businesses on Google Maps, not just this one.
Great professional team, accommodated to basement restrictions, and cleaned up after the work. Levels dropped to under 1 after the first day
Response from the owner · 2 months ago
Thank you, David! We are thrilled to hear our team did a great job accommodating your basement and getting those levels down so quickly. We appreciate your feedback!
Matthew Payne13 reviewsiTotal number of Google reviews Matthew has written across all businesses on Google Maps, not just this one.
We had an excellent experience with Great Lakes Radon. Our sump pump posed unique challenges that cause other companies to turn down the work. However, Great Lakes Radon approached the job with confidence and assured us they could install an effective mitigation system. The team who installed our system were very professional, answered our questions, and our mitigation system is working perfectly. If you are in need of radon mitigation, I would highly recommend Great Lakes Radon!
Response from the owner · 2 months ago
Thank you for the recommendation, Matthew! We're so glad our team was able to tackle the unique challenges with your sump pump and get your radon mitigation system working perfectly.
James DinkinsLocal Guide · 20 reviewsiTotal number of Google reviews James has written across all businesses on Google Maps, not just this one.
GLR came out and did a great job installing a migration system in my new home. It took about an hour.
Response from the owner · 3 months ago
Thank you for the great review, Kyle! We're glad Dalton and Logan did a fantastic job with your radon mitigation system. If you need anything else, feel free to reach out!
