Top 10 Mold Remediation Companies in California (2026)

Published: May 30, 20262026504 words2 min read

Key Takeaways

10 mold remediation firms in California qualified for this ranking based on verified data from public sources (BBB, Google, IICRC, EPA, Yelp, Angi, HomeAdvisor).
The top firm in this ranking is PW Stephens Environmental, with a MetaScore of 100/100.
Every firm here carries at least one publicly verifiable signal — no firm appears in this article without a cited source.
This list is filtered to firms that explicitly offer mold remediation services. Multi-discipline firms appearing here have that service confirmed on their website or in their public certifications.
Methodology is published in full at restorationindex.com/methodology. Firms can request a correction at restorationindex.com/contact.

Sources cited in this article: Better Business Bureau, Institute of Inspection, Cleaning and Restoration Certification, U.S. Environmental Protection Agency, Google, Yelp, Angi, HomeAdvisor, and Restoration Index.

Based on aggregated public-source data from BBB Business Profiles, Google Business Profile reviews, IICRC certified member directory, EPA Lead-Safe registry, Yelp, Angi Super Service Award lists, and HomeAdvisor recognition, here are the top-ranked mold remediation firms in California. Each firm receives a 0-100 Restoration Index MetaScore weighted across 9 sources.

Top 10 Mold Remediation Companies in California — Ranked by Multi-Source MetaScore

PW Stephens Environmental (Oakland, CA) — MetaScore 100/100. EPA Lead-Safe. founded 1982. Read the full review.
AmeriGuard Restoration Services (San Diego, CA) — MetaScore 92/100. 4.9-star Google rating across 326 reviews. BBB A+ accredited. IICRC S500, S520. EPA Lead-Safe. founded 2005. San Diego Best Of 2023, San Diego Best Of 2024. Read the full review.
SERVPRO of Downtown Los Angeles (Los Angeles, CA) — MetaScore 91/100. 4.8-star Google rating across 412 reviews. BBB A+ accredited. IICRC S500, S520, ASD. EPA Lead-Safe. founded 2003. LA Business Journal Restoration Award 2024. Read the full review.
Advanced Mold & Water Restoration (San Francisco, CA) — MetaScore 91/100. 4.8-star Google rating across 142 reviews. BBB A+ accredited. IICRC S500, S520. EPA Lead-Safe. founded 2002. SF Examiner Best of the Bay 2023. Read the full review.
Central Valley Restoration (Fresno, CA) — MetaScore 89/100. 4.8-star Google rating across 92 reviews. BBB A+ accredited. IICRC S500, S520. EPA Lead-Safe. founded 1998. Fresno Bee Best of Central Valley 2024. Read the full review.
Paul Davis Restoration of Greater Los Angeles (Los Angeles, CA) — MetaScore 89/100. 4.7-star Google rating across 289 reviews. BBB A+ accredited. IICRC S500, S520, S540, ASD. EPA Lead-Safe. founded 1998. Read the full review.
Delta Restoration Services of Greater Sacramento (Sacramento, CA) — MetaScore 87/100. 4.7-star Google rating across 211 reviews. BBB A+ accredited. IICRC S500, S520, ASD. EPA Lead-Safe. founded 2010. Read the full review.
PuroClean of Hollywood (Los Angeles, CA) — MetaScore 84/100. 4.9-star Google rating across 178 reviews. BBB A+ accredited. IICRC S500, S520. founded 2011. Read the full review.
Reactic Restoration (Oakland, CA) — MetaScore 84/100. 4.9-star Google rating across 69 reviews. BBB A+ accredited. IICRC certified. founded 2000. Diamond Certified. Read the full review.
Rainbow Restoration of the Bay Area (San Francisco, CA) — MetaScore 84/100. 4.6-star Google rating across 96 reviews. BBB A+ accredited. IICRC S500, S520, ASD. EPA Lead-Safe. founded 2008. Read the full review.

Top mold remediation firms in Los Angeles

SERVPRO of Downtown Los Angeles leads Los Angeles with a MetaScore of 91/100 and 412 Google reviews. Other top-ranked firms in Los Angeles include Paul Davis Restoration of Greater Los Angeles (MetaScore 89/100), and PuroClean of Hollywood (MetaScore 84/100).

Top mold remediation firms in Oakland

PW Stephens Environmental leads Oakland with a MetaScore of 100/100. Other top-ranked firms in Oakland include Reactic Restoration (MetaScore 84/100).

Top mold remediation firms in San Francisco

Advanced Mold & Water Restoration leads San Francisco with a MetaScore of 91/100 and 142 Google reviews. Other top-ranked firms in San Francisco include Rainbow Restoration of the Bay Area (MetaScore 84/100).

Frequently Asked Questions

How is the Restoration Index MetaScore calculated?

The MetaScore is a weighted average of nine normalized component scores: Google Business Profile reviews (25%), BBB rating + complaint history (20%), IICRC certification (12%), EPA Lead-Safe registry (8%), years in business (10%), Yelp reviews (10%), Angi Super Service Award (5%), HomeAdvisor Top Rated (5%), and regional industry awards (5%). Firms with sparse data have weights redistributed proportionally across the sources we did find. Full methodology at restorationindex.com/methodology.

Who is the top-ranked mold remediation company in California?

As of May 2026, PW Stephens Environmental ranks #1 in California for mold remediation with a MetaScore of 100/100. The full ranking and per-firm breakdowns appear below.

How often is this list updated?

Firm-level data (reviews, BBB ratings, certifications) is refreshed every 30 to 90 days depending on the source. Awards and recognition fields refresh annually. The "Last refreshed" date below the article header reflects the most recent data refresh for this article.

Can firms pay to be included or ranked higher?

No. Restoration Index does not accept paid placement. The MetaScore is calculated identically for every firm in the index, whether or not they have any commercial relationship with Pleiades Consultancy (the publisher of this site). The methodology is published in full so firms can audit how the calculation works.

What if a firm I trust is missing from this list?

Coverage is rolling out city by city. If a firm meets our inclusion criteria (operating in the named region, offering mold remediation services, with at least one verifiable public signal), they will appear in future refreshes. Firms can also reach out via restorationindex.com/contact to request inclusion.

Sources & Further Reading

Every claim in this article is backed by at least one of the following third-party sources. Linked out to the publisher so you can audit the original.