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In California, 364 companies are registered to do this work. Most advertisers are not.
An independent guide to biohazard, trauma and sewage remediation in the United States. What it costs by scenario, who is actually registered to do it, what insurance usually covers, and how to check a company before you let it into a property.
This is one of the few trades where a public register exists and nobody mentions it
Biohazard remediation is bought under pressure. Somebody has died, a property is contaminated, and the decision gets made in an afternoon from whoever answers the phone. That is exactly the situation in which verification is skipped.
In California there is something concrete to verify against. The Medical Waste Management Act requires any person or company paid to clean a trauma scene to register with the Department of Public Health, and the Department publishes the register. As of its May 2026 list there are 364 registered practitioners.
It is worth knowing what that register is and is not. The Department states plainly that registration carries no expressed or implied endorsement of the quality of work, and that it does not require a practitioner to hold a contractor's licence. So registration is a floor, not a recommendation. Other states arrange this differently, and many do not register the trade at all, which makes the certification and insurance questions on this site the ones that carry the weight.
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Who is actually registered
California requires anyone paid to clean a trauma scene to register with the Department of Public Health, and publishes the list. There are 364 registered practitioners. Almost nobody tells you that list exists, what registration does and does not mean, or that the state explicitly says it is not an endorsement of quality.