California Code, Labor Code - LAB § 1181

(a) Give public notice thereof by advertisement in at least one newspaper published in each of the cities of Los Angeles, Oakland, Sacramento, San Jose, Fresno, Eureka, San Diego, Long Beach, Alameda, Berkeley, Stockton, San Bernardino, and San Francisco.

(b) Mail a copy of the notice and the proposed regulations to the clerk of the superior court of each county in the state to be posted at the courthouse;  to each association of employers or employees which, in the opinion of the commission, would be affected by the hearing;  and to any person or organization within this state filing with the commission a written request for notice of such hearing.  Failure to mail such notice shall not invalidate any order of the commission issued after such hearing.

The notice shall also state the time and place fixed for the hearing, which shall not be less than 30 days from the date of publication and mailing of such notices.