Mold Remediation & Assessment in California
547 certified mold remediation firms on file in California. 4 of them hold a mold licence issued by another state — worth knowing, but there is no California licence to check. Credentials below are verified against IICRC's Certified Firm registry.
Cities with 3+ certified firms
Also served (1–2 firms)
Beaumont, Camarillo, Canoga Park, Burlingame, Livermore, Mammoth Lakes, Montclair, Loomis, Half Moon Bay, Encinitas, El Centro, Gardena, Grass Valley, Huntington Beach, Downey, Chino, City Of Industry, Victorville, Vista, West Hills, Westlake Village, Walnut Creek, Upland, Sherman Oaks, Thousand Palms, Tarzana, Sun Valley, Panorama City, Pacoima, Orange, Lancaster, Ladera Ranch, La Verne, San Rafael, Sand City, Santa Barbara, Santee, San Clemente, Redlands, Redondo Beach
What California mold remediation firms are certified in
Certification counts across the 547 California firms on file for this work. These are the credentials on record with the issuing body — not what the firms advertise.
| Credential | What it covers | California firms |
|---|---|---|
| WRT | Water Damage Restoration Technician | 542 |
| AMRT | Applied Microbial Remediation Technician | 539 |
| FSRT | Fire and Smoke Damage Restoration Technician | 406 |
| ASD | Applied Structural Drying Technician | 382 |
| OCT | Odor Control Technician | 277 |
| CCT | Carpet Cleaning Technician | 153 |
481 of these firms hold three or more certifications; 9 appear in two independent registries and carry a cross-verified marker; 160 operate under a national franchise brand, which is separately owned and separately credentialled from the brand itself.
Every California firm we hold a record for, A–Z by city →
Mold Remediation in California: common questions
Is mold remediation licensed in California?
California does not run a mold-specific licensing program. Only five US jurisdictions do (Texas, Florida, New York, Louisiana and the District of Columbia; Illinois has enacted a program that is not yet in force). In California, the credentials to check are IICRC certification, general contractor licensing where applicable, and insurance.
What certifications do California mold remediation firms actually hold?
Across the 547 California firms on file for this work, the most common credentials are WRT (Water Damage Restoration Technician) held by 542 firms, AMRT (Applied Microbial Remediation Technician) held by 539 firms, FSRT (Fire and Smoke Damage Restoration Technician) held by 406 firms, ASD (Applied Structural Drying Technician) held by 382 firms. 481 hold three or more certifications. Certification describes verified training rather than the services a firm chooses to advertise.
How were these California firms verified?
Every certification was checked against IICRC's own Certified Firm registry, not against the firm's marketing. 9 of the 547 appear in two independent registries and carry a cross-verified marker. Checked August 14, 2026.
Which California cities have the most mold remediation firms?
San Diego leads with 31, followed by Riverside (17), Sacramento (15), Anaheim (14). We build a page wherever a city has three or more certified firms; smaller markets are listed below that without their own page.