California Code, Civil Code - CIV § 8104

(a) A direct contractor or subcontractor on a work of improvement governed by this part that employs a laborer and fails to pay the full compensation due the laborer, including any employer payments described in Section 1773.1 of the Labor Code and implementing regulations, shall not later than the date the compensation became delinquent, give the laborer, the laborer's bargaining representative, if any, the construction lender or reputed construction lender, if any, and the owner or reputed owner, notice that includes all of the following information, in addition to the information required by Section 8102:

(b) Failure to give the notice required by subdivision (a) constitutes grounds for disciplinary action under the Contractors' State License Law, Chapter 9 (commencing with Section 7000) of Division 3 of the Business and Professions Code.