CDPH states that there is no legal requirement in California for training, licensing or certification of mold assessors to identify a mold or dampness problem, or of mold remediators to fix one. There are no California regulations covering mold inspection, assessment or remediation.
What does apply is the ordinary contractor licence: a company performing building construction or improvement valued at $500 or more, labour and materials combined, must hold a state contractors' licence. Beyond that, the only credential is voluntary certification from a body such as IICRC, NORMI or NAMRI, which CDPH lists for information without endorsing.
Source: California Department of Public Health (CDPH). Checked 2026-08-14.
California issues no credential of its own, so the contractor's certification is doing all the work. Ask which body certified the crew and to what standard, and expect IICRC S520 for mold or S500 for water. Then ask for proof of liability cover, because in California nothing else is being checked on your behalf.
With no state credential to pay for, California pricing tracks the national ranges closely. That cuts both ways, because the cheapest quote and the most careful crew are indistinguishable on paper here.
Drying itself is priced the same in California as anywhere else; the published national ranges are on the pricing page.
Metro guides for California publish once three local facts can be sourced for a city: named operators, local flood risk and the county permit office. Until then the California position above is the state-level answer, and the national guides below cover cost and process.
California has no licensing requirement for mold work at all, and CDPH says so directly.
With no state credential, the contractor's own certification is doing all the work. Ask which body certified the crew and to what standard, and expect IICRC S520 for mold or S500 for water. Then ask for proof of liability cover, because in California nothing else is being checked on your behalf.
California Department of Public Health (CDPH). Position checked 2026-08-14. California can change its rules, so confirm current requirements with California Department of Public Health (CDPH) before relying on this for a decision.
Emergency Response
Call and a crew is dispatched - extraction the same day, drying equipment set the same visit, and the documentation your claim needs from the first hour.
