How to Choose a Mold Remediation Company

Mold remediation in California is partially regulated and partially wild west. The license requirements are minimal compared to other states, which means quality varies more. Choosing a competent remediator means knowing what to ask.

California licensing reality

California requires no specific mold remediation license at the state level. Companies doing structural work need a B or C-35 license from the Contractors State License Board. Some counties (notably Los Angeles for certain scopes) have local certification requirements. Ask what licenses the company holds.

IICRC AMRT certification

The relevant industry credential is IICRC AMRT (Applied Microbial Remediation Technician). This is voluntary but widely held by competent operators. Verify credentials at the IICRC website using the technician's ID number.

Independent testing

The company that remediates shouldn't also do the pre- and post-testing. That's a conflict of interest the EPA flags. Hire an independent Industrial Hygienist (CIH) or Indoor Air Quality consultant for testing if testing is part of your scope.

Written scope of work

Get a written scope before any work starts. The scope should specify: containment method (plastic sheeting, negative air), HEPA filtration equipment, materials to be removed, antimicrobial product, clearance testing approach, and timeline. SoCal Dry Pro and similar reputable companies provide this as standard.

Red flags to avoid

'Mold killing' sprays advertised as alternatives to physical removal. Quotes given without on-site assessment. Pressure to sign before getting other estimates. Companies that test, remediate, and verify their own work. Lifetime guarantees on mold remediation (mold can return if moisture sources reappear — no real guarantee can be lifetime).