Analyzing 9,834,9439.8M ReviewsFor 27,69627.7K Experts
We graded 10 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 29,035 Google reviews of 82 top-rated radon testing services nationwide; 10 of them in Milwaukee, WI. Updated November 11, 2026.
Pick the job — we re-rank companies by how customers rated that exact job.
Experts Score 0–100Experts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. and a letter grade per factor (A = top 20% of radon testing services).
| # | Company | ScoreExperts Score (0–100)Absolute quality first: recency-weighted star average (≈54%), share of 1–2★ reviews (≈24%), customers’ price verdicts (≈14%), owner replies to critical reviews (≈7%); minus up to 10 points each for complaints flagged in Google review highlights and for a real slide in recent ratings. Hover a company’s score on its page for the full breakdown. | FactorsFactor grades, in orderSatisfaction (54%): Recency-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.Reliability (24%): How 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.Craft & service (0%): Google 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.Value (14%): Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.Momentum (0%): Penalises 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.Replies to reviews (7%): How 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.One letter per factor score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = below 20. | ★Google star rating as shown on Google Maps. | Typical billMedian bill customers of this company reported in their reviews (needs 3+ priced reviews). |
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| 1 |  Advanced Inspections LLCMilwaukee, WI | A 100How 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 59%100+58.7Reliability 26%99+25.8Value 15%100+15.2Experts Score= 100Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 5.00 | — |
| 2 |  Wisconsin Radon & Environmental, LLCMilwaukee, WI | A 99How 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 59%100+58.7Reliability 26%100+26.1Value 15%95+14.5Experts Score= 99Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAA– | 5.00 | — |
| 3 |  Milwaukee Radon MitigationMilwaukee, WI | A 99How 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 69%99+68.5Reliability 31%98+30.2Experts Score= 99Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––A– | 5.00 | — |
| 4 |  A-1 RadonMilwaukee, WI | A 97How 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%97+52.9Reliability 24%99+24Value 14%100+14.1Replies to reviews 7%87+6.2Experts Score= 97Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.97 | — |
| 5 |  Homesight Inc Inspection ServiceMilwaukee, WI | A 94How 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%93+50.7Reliability 24%92+22.3Value 14%100+14.1Replies to reviews 7%100+7.1Craft & service penalty95−0.5Experts Score= 94Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AAAAAA | 4.92 | — |
| 6 |  Radon Measurement & Elimination ServicesMilwaukee, WI | A 94How 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 69%95+65.8Reliability 31%91+28Experts Score= 94Not enough data for value, replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AA––A– | 4.95 | — |
| 7 |  Lifetime Radon SolutionsMilwaukee, WI | A 80How 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 64%85+54Reliability 28%78+22Replies to reviews 8%100+8.2Momentum penalty58−4.2Experts Score= 80Not enough data for value; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | AB––CA | 4.88 | — |
| 8 |  Wall To Wall Home Inspection Services LLCMilwaukee, WI | B 79How 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%81+44.2Reliability 24%73+17.7Value 14%100+14.1Replies to reviews 7%70+4.9Craft & service penalty77−2.3Experts Score= 79Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | ABBAAB | 4.79 | — |
| 9 |  SWAT Radon MitigationMilwaukee, WI | B 79How 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%79+43.1Reliability 24%71+17.2Value 14%94+13.3Replies to reviews 7%76+5.4Experts Score= 79Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BB–AAB | 4.77 | — |
| 10 |  Amelia's Home InspectionMilwaukee, WI | B 60How 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%75+40.9Reliability 24%39+9.5Value 14%100+14.1Replies to reviews 7%100+7.1Craft & service penalty88−1.2Momentum penalty0−10Experts Score= 60Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BDAAFA | 4.87 | — |
What customers paid, from the price Google asks reviewers to report.
| Job | Low25th percentile: 1 in 4 customers paid less than this. | TypicalMedian of the bill customers reported in their Google review (Google asks reviewers for a price range; we use the middle of each range). | High75th percentile: 1 in 4 customers paid more than this. | FairOf customers who rated the price, the share who chose “Great price” or “Reasonable” rather than “Overpriced”. |
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How the 10 radon testing services we rated in Milwaukee, WI compare, and what customers praise most.
A = score 80+, F = below 20.
Average stars per company.
Share of Google review highlights.
All price verdicts left with reviews.
Share calling it great / reasonable / overpriced.
Satisfaction (54%) — Recency-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.
Reliability (24%) — How 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.
Craft & service (penalty, up to −10) — Google 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.
Value (14%) — Customers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.
Momentum (penalty, up to −10) — Penalises 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.
Replies to reviews (7%) — How 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.
The 10 best-rated radon testing services in Milwaukee, WI average 4.9★ on Google across 3,391 reviews. Wisconsin Radon & Environmental, LLC has the top rating (5.0★), and Homesight Inc Inspection Service has the most reviews (1,496). Updated November 10, 2026.
10 companies that meet our bar: rated 4.5★ or higher on Google, with a meaningful review history (3,391 reviews combined) and currently operating. Request a call back and the company will phone you directly.
“Jerome was fantastic ! He made a custom sump crock cover that’ll allow me to maintain/change sump pumps easily! Communication was first rate and radon system has a clean look on the exterior and interior. Great…” — Google review
“Bob was very informative and thorough with the inspection he took his time I definitely will recommend him he did a great job. Thanks” — Google review
“I highly recommend having A-1 mitigate your radon. They’re extremely professional and communication is on point. The work is very clean and concise. Job well done!” — Google review
“We quoted out multiple companies and chose RMES. They had a competitive price, a responsive owner, provided examples of what it would look like when all was done. Great family run business and our levels fell…” — Google review
“Mike and his team at Lifetime Radon Solutions are a trusted vendor for our real estate clients. They are timely and knowledgable. If you are concerned about Radon in your basement, make them your first call! Rob K” — Google review
“Very detailed and kind, almost a perfectionist. Marc is an excellent communicator. Passionate about his work and gave us very thoughtful detailed and precise info on our home.” — Google review
“John was very thorough, explained his findings well and provided an easy to read report. Would definitely recommend and choose him again!” — Google review
“Great price and great company. Luke was super informative and very kind ! He walked us through everything and gave lots of good recommendations. We would use this company over and over again.” — Google review
“They did an excellent job! They were professional and fully communicated what was being done. I definitely recommend SWAT Environmental!” — Google review
“Brian was wonderful to work with! We wanted someone we could trust given the safety of our family. He was very helpful in answering all of our questions, is extremely knowledgeable and made the process easy. We were…” — Google review
We scan Google Maps for radon testing service listings in and around Milwaukee, keep only open businesses whose main category matches the service, and require a Google rating of at least 4.5 from at least 20 reviews. Companies are ordered by a confidence-weighted score that balances rating and review volume. We do not accept payment for placement.
Wisconsin Radon & Environmental, LLC has the highest Google rating on our Milwaukee list: 5.0 out of 5 from 366 reviews (as of November 10, 2026).
Homesight Inc Inspection Service has the most Google reviews among the companies listed here: 1,496, with a 4.9★ average.
Only open Milwaukee-area businesses whose Google category matches the service, rated at least 4.5★ from at least 20 Google reviews. They are ordered by a confidence-weighted score of rating and review volume. Placement is never paid.
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Analyzing 9,834,9439.8M ReviewsFor 27,69627.7K Experts