California Department of Transportation

Find A Certified Firm

To locate a Certified Firm, you can either use our new Query Form. or if you prefer to download files and create your own database, use the Work Files page.  You can refer to our Help Page, if you wish.

If you receive an error when trying to reach the Query Form page, please try deleting the saved files from your browser's file cache. Instructions are below, if you need them.

If you are using Microsoft Internet Explorer 5, the file cache can be deleted by choosing from the menu, Tools, Internet Options, and clicking on the Delete Files button which is in the middle of the page in the area marked "Temporary Internet Files".

For other versions of Internet Explorer, to clear your cache, go to the View menu and select Internet Options. Then click on the General tab. Go to the Temporary Internet files section and click the Delete Files button.

For earlier versions of Internet Explorer, click on View, then Options, and select the Advanced Tab then click on the button marked "Empty".

To clear your cache in Navigator 4.x, go to the Edit menu and select Preferences, then go to the Advanced category, select Cache, and click both the Clear Memory Cache and Clear Disk Cache buttons.