The Best Air Quality Testing
We graded 9 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 656 Google reviews of 9 top-rated air quality testing nationwide. Updated November 6, 2026.
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Best air quality testing for mold sampling
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California Healthy Home Inspections & Remediation Inc.How Job match is calculatedBuilt only from reviews Google tagged “Mold sampling”:Stars on this job 55%5.00★Number of such jobs 25%41Overall Experts Score 20%98Job match= 99Stars are pulled toward the category average (4.93★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.99
Fast Mold Testing - San Francisco Bay AreaHow Job match is calculatedBuilt only from reviews Google tagged “Mold sampling”:Stars on this job 55%5.00★Number of such jobs 25%25Overall Experts Score 20%97Job match= 95Stars are pulled toward the category average (4.93★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.95
A-1 Certified Environmental ServicesHow Job match is calculatedBuilt only from reviews Google tagged “Mold sampling”:Stars on this job 55%5.00★Number of such jobs 25%3Overall Experts Score 20%67Job match= 74Stars are pulled toward the category average (4.93★) when a company has few tagged jobs, so 3 perfect reviews don’t beat 80 great ones. 4.3★ scores 0, 5.0★ scores full. Volume is compared with the busiest company for this job.74Job match = this company’s ★ on reviews Google tagged “Mold sampling” (shrunk toward the category average when there are few), how many such jobs it has done, and its overall Experts Score.
What customers said about mold sampling
Fast Mold Testing - San Francisco…Replied promptly and had an inspector out the next day. The report came back quickly after that and they helped me find contractors to remediate the issue.
California Healthy Home Inspectio…The best mold inspection company in the San Francisco Bay Area! ⭐️ A huge thank you to Aziz, Stephen, Brayan, and Bhavesh. What an amazing team! They are incredibly professional, knowledgeable, patient, and thorough. They took the time to answer all our questions and made the whole process so much easier. I highly…
Fast Mold Testing - San Francisco…Fast Mold Testing was great and professional! They got back to my initial inspection request within 30 minutes and scheduled an appointment for the next day. The inspection itself went smoothly, with the employees being professionals.
California Healthy Home Inspectio…We had an amazing experience with California Healthy Home Inspections & Remediation! They were able to come out very quickly and were incredibly professional, kind, and thorough. The inspection was extremely detailed, and they took the time to explain everything clearly, including the mold findings and the…
California Healthy Home Inspectio…We hired California Healthy Home to conduct a mold assessment on our home. The inspection was very professional and thorough and their report was timely and as promised. We hired them to remediate in a couple limited areas of the home. Their remediation team was a very professional and very easy to work with and…
California Healthy Home Inspectio…Stephen and Zem are incredible! I’m in an ongoing dispute with my property manager and have peace of mind with California Healthy Homes’ support. Their team is very knowledgeable and friendly. If you’re looking for a company that is willing to go the extra mile, choose California Healthy Home.
Overall ratings
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 air quality testing).
| # | 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 | California Healthy Home Inspections & Remediation Inc.San Francisco, CA | A 98How 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%98+57.5Reliability 26%96+25Value 15%100+15.2Experts Score= 98Not 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– | 4.99 | — |
| 2 |  Your Safe and Healthy HomeAkron, OH | A 98How 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%98+67.8Reliability 31%97+29.8Experts Score= 98Not 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 | — |
| 3 | Fast Mold Testing - San Francisco Bay AreaSan Francisco, CA | 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 59%99+58.1Reliability 26%99+25.8Value 15%87+13.2Experts Score= 97Not 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. | AA–AA– | 4.99 | — |
| 4 | AMT Mold Testing & Indoor Air Quality ConsultingPemberton, NJ | A 95How 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%95+55.8Reliability 26%93+24.3Value 15%100+15.2Experts Score= 95Not 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– | 4.92 | — |
| 5 |  Environmental Safety Management CorporationPemberton, NJ | A 95How 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%94+65.1Reliability 31%97+29.8Experts Score= 95Not 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– | 4.91 | — |
| 6 |  HEPA Environmental Services, Inc.Akron, OH | A 92How 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%91+57.8Reliability 28%97+27.4Replies to reviews 8%86+7.1Experts Score= 92Not 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. | AA––AA | 4.88 | — |
| 7 |  Acer Associates, LLC - Environmental, GPR, GeotechnicalPemberton, NJ | B 77How 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%79+54.7Reliability 31%71+21.8Experts Score= 77Not enough data for value, replies to reviews; its weight is shared by the others.Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BB––A– | 4.69 | — |
| 8 | A-1 Certified Environmental ServicesSan Francisco, CA | B 67How 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%72+39.3Reliability 24%63+15.3Value 14%100+14.1Replies to reviews 7%46+3.3Momentum penalty46−5.4Experts Score= 67Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | BBAACC | 4.81 | — |
| 9 |  Summit Environmental TechAkron, OH | C 52How 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%56+35.6Reliability 28%54+15.2Replies to reviews 8%16+1.3Experts Score= 52Not enough data for value; its weight is shared by the others.Grade C: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews. | CC–––F | 4.45 | — |
What jobs cost
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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Air Quality Testing at a glance
How the 9 air quality testing we rated compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A667%
- Grade B222%
- Grade C111%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up556%
- 4.80–4.89★222%
- 4.60–4.79★111%
- Below 4.60★111%
What customers praise
Share of Google review highlights.
- Quality10322%
- Professionalism12427%
- Responsiveness11926%
- Punctuality286%
- Value9120%
Was the price fair?
All price verdicts left with reviews.
- Great price2631%
- Reasonable5263%
- Overpriced22%
- Not sure34%
Price verdicts by year
Share calling it great / reasonable / overpriced.
How we grade
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.