Remediation contractors based in California

858 contractors based in California listed on official license rosters. See license status and issuing board for each.

Each listing shows the board that issued its license, including the license number when the board publishes one.

Services for companies based in California

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Licensing in California

Asbestos licensing in California

In California, contractors who disturb 100 square feet or more of asbestos-containing material need a C-22 asbestos abatement classification (or a CSLB asbestos certification) and a Cal/OSHA asbestos registration. Individual asbestos consultants and site technicians are certified by Cal/OSHA. CSLB license numbers are digits only, up to eight. Look up the license on record at CSLB, and the registration in Cal/OSHA's asbestos registrants database. Smaller jobs follow different rules, so check the agencies' sites for current requirements.

Official lookup (opens in a new tab)Contractors State License Board (CSLB) and Cal/OSHA Asbestos Contractors' Registration Unit (Dept. of Industrial Relations) (opens in a new tab)

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Mold licensing in California

California does not have a state license, training or certification requirement for mold inspectors or remediators, so a mold-specific credential is not something the state can confirm. Work that counts as construction or improvement of $500 or more in labor and materials generally needs a California contractor license, which you can look up on the Contractors State License Board site. Some companies hold voluntary national credentials. Ask for details in writing and check the agencies' sites for current requirements.

Official lookup (opens in a new tab)None for mold. (CSLB licenses general contractors; CDPH publishes mold guidance.) (opens in a new tab)

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Lead licensing in California

California certifies lead abatement workers, supervisors, inspectors and related lead-related construction roles through the Department of Public Health. For ordinary renovation or painting in a home built before 1978, California follows EPA's federal Lead-Safe program, where the firm is certified by EPA. Look up individuals in CDPH's index of lead-certified professionals, and firms in EPA's Lead-Safe Certified Firm locator. The agencies' lists can lag, so confirm with them and check their sites for current requirements.

Official lookup (opens in a new tab)California Dept. of Public Health, Childhood Lead Poisoning Prevention Branch (CDPH-CLPPB); EPA for RRP (opens in a new tab)

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Radon licensing in California

California requires radon testers and mitigators to be certified through a national program (NRPP or NRSB) and to submit that certificate to the Department of Public Health. Mitigators must also hold a California contractor license in class B, C-20, C-36 or D-64. The department publishes a list of certified radon service providers, and you can look up the contractor license separately at the Contractors State License Board. Lists may lag, so check the agencies' sites for current requirements.

Official lookup (opens in a new tab)California Dept. of Public Health, Indoor Radon Program (with CSLB for the contractor license) (opens in a new tab)

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Last reviewed November 2026. Rules change, so confirm with the agency.