The Best Hazardous Material Removal in Palmdale, CA
We graded 4 companies on seven things customers actually report: satisfaction, reliability, workmanship, value, momentum, track record and how owners handle complaints.
From 8,463 Google reviews of 84 top-rated hazardous material removal nationwide; 4 of them in Palmdale, CA. Updated November 2, 2026.
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Best hazardous material removal in Palmdale for mold remediation
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Environmental 911How Job match is calculatedBuilt only from reviews Google tagged “Mold remediation”:Stars on this job 55%5.00★Number of such jobs 25%7Overall Experts Score 20%97Job match= 93Stars are pulled toward the category average (4.84★) 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.93Job match = this company’s ★ on reviews Google tagged “Mold remediation” (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 remediation
Environmental 911Unfortunately had water damage and mold that damaged multiple floors and affected our renters. Fortunately, Efren and his team saved the day! Efren is truly an exceptional team leader who goes above and beyond the remediation to working with renters to ease their fears. Professional and very efficient- a joy to work…
Environmental 911Had a great experience with Enviro 911. Russell was professional, responsive, and easy to work with from start to finish. They explained everything clearly, showed up when they said they would, and did a thorough job. I really appreciated how smoothly they handled everything and how communicative they were…
Environmental 911Had a water loss in the slab as well as leaking drainage pipes upstairs. Russ and his crew were on it from the very beginning. Professional, caring and understanding. I would recommend them for any environmental work that you need done, without qualification. They really care!!
Environmental 911Everyone who worked on our home was so professional, knowledgeable, and helpful. You can tell they genuinely care and have a passion for what they do. They eased our fears and remediated our home safely and successfully.
Environmental 911I was impressed with their professionalism, responsiveness, and cleanliness. I would definitely recommend.
Environmental 911Russell was very helpful and took good care of my case. The workers were very nice and did a great job. I especially appreciate how well they cleaned up afterward.
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 hazardous material removal).
| # | 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 |  Capitol Demolition and Junk Removal LancasterPalmdale, CA | 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%99+58.1Reliability 26%97+25.3Value 15%100+15.2Experts 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. | AA–AA– | 5.00 | — |
| 2 | Environmental 911Palmdale, 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%97+56.9Reliability 26%95+24.8Value 15%100+15.2Craft & service penalty96−0.4Experts 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. | AAAAA– | 4.98 | — |
| 3 |  Rainy Day Environmental SolutionsPalmdale, CA | 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%94+24.5Value 15%100+15.2Craft & service penalty98−0.2Experts 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– | 4.96 | — |
| 4 |  MEC Environmental, Inc.Palmdale, CA | 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%95+65.8Reliability 31%95+29.2Experts 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– | 4.92 | — |
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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Hazardous Material Removal in Palmdale, CA at a glance
How the 4 hazardous material removal we rated in Palmdale, CA compare, and what customers praise most.
Experts Score grades
A = score 80+, F = below 20.
- Grade A4100%
- Grade B00%
- Grade C00%
- Grade D00%
- Grade F00%
Google ratings
Average stars per company.
- 4.90★ and up4100%
- 4.80–4.89★00%
- 4.60–4.79★00%
- Below 4.60★00%
What customers praise
Share of Google review highlights.
- Quality1,11421%
- Professionalism1,34625%
- Responsiveness1,05319%
- Punctuality98618%
- Value92417%
Was the price fair?
All price verdicts left with reviews.
- Great price21852%
- Reasonable17341%
- Overpriced61%
- Not sure246%
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.