California maintains an Accreditation & Certification Program. Information can be obtained from the Department of Health Services, Childhood Lead Poisoning Prevention Branch, Lead Accreditation and Certification Unit, 1515 Clay St., Suite 1801, Oakland, CA 94612. They have a Lead-Related Construction Information Line at 1-510-622-5000.
Information can be obtained on accredited inspectors on the web at:
http://www.dhs.ca.gov/childlead
Note that individual inspectors are accredited, not Companies. Individuals are listed alphabetically by telephone area code. For example, HMA's principal, Scott W. Compton's listing will be found under area code 510, and is on page:
http://www.dhs.ca.gov/childlead/html/B40-ebay.html#inspector