Approved Backflow Prevention Devices List
Those seeking to acquire the list of approved backflow prevention devices should call the Drinking Water Program at (916) 449-5600 and request a copy of the list [or the portion needed -- the list is by size of device, so if you’re only looking for a 4-inch reduced pressure (RP) backflow prevention device, for example, only a page or two may be needed].
University of Southern California List of Approved Backflow Devices
(In order to view the approved list, a membership is required and explained on the USC's web site)
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City of Huntington Beach
Public Works Department
2000 Main Street
Huntington Beach, CA
Phone: (714) 536-5431
Fax: (714) 374-1573