Biohazard & Trauma Cleanup in California
141 certified biohazard cleanup firms on file in California. Credentials below are verified against IICRC's Certified Firm registry.
Cities with 3+ certified firms
Also served (1–2 firms)
Atascadero, Camarillo, Encino, Chatsworth, Laguna Hills, Lake Forest, Fresno, Fremont, Poway, Spring Valley, Canoga Park, Bellflower, Chino, Clovis, Concord, Castroville, Cotati, Cypress, Carson, Carmichael, Azusa, Banning, Antelope, American Canyon, Eureka, Escondido, Encinitas, Elk Grove, Downey, El Centro, Glendale, Glendora, Hacienda Heights, Granada Hills, Hemet, Hayward, Kelseyville, Laguna Niguel, Fallbrook, Gardena
What California biohazard cleanup firms are certified in
Certification counts across the 141 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 |
|---|---|---|
| TCST | Trauma and Crime Scene Technician | 141 |
| WRT | Water Damage Restoration Technician | 139 |
| FSRT | Fire and Smoke Damage Restoration Technician | 121 |
| AMRT | Applied Microbial Remediation Technician | 116 |
| ASD | Applied Structural Drying Technician | 111 |
| OCT | Odor Control Technician | 106 |
137 of these firms hold three or more certifications; 2 appear in two independent registries and carry a cross-verified marker; 57 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 →
Biohazard Cleanup in California: common questions
Is biohazard cleanup work licensed in California?
No US state licenses biohazard cleanup work specifically. General contractor registration may apply to any rebuild that follows. The checkable credential is IICRC certification, which is what every listing on this page is verified against.
What certifications do California biohazard cleanup firms actually hold?
Across the 141 California firms on file for this work, the most common credentials are TCST (Trauma and Crime Scene Technician) held by 141 firms, WRT (Water Damage Restoration Technician) held by 139 firms, FSRT (Fire and Smoke Damage Restoration Technician) held by 121 firms, AMRT (Applied Microbial Remediation Technician) held by 116 firms. 137 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. 2 of the 141 appear in two independent registries and carry a cross-verified marker. Checked August 14, 2026.
Which California cities have the most biohazard cleanup firms?
Sacramento leads with 8, followed by San Diego (5), Bakersfield (4), Riverside (4). We build a page wherever a city has three or more certified firms; smaller markets are listed below that without their own page.