I know this post is old but I did want to let people know in CA you can definately email your caseworker.
In LA its:
lastnamefirstinitial@dcfs.lacounty.gov
ex:
smithj@dcfs.lacounty.gov
Sometimes it's slightly different depending on the persons name but you can usually figure it out. If it's wrong it will just bounce back.
I have had the best luck calling but I do have my caseworker's email address. ALL caseworkers have email and if they don't give it to you I think it's because they don't want to have a papertrail.
Good luck in communicating with your CW.