California Code, Streets and Highways Code - SHC § 18074

(a) Any person interested who objects to the proposed improvement may file a written protest, stating his or her objections , with the clerk at or before the hour set for the hearing of protests.  The clerk shall indorse on every protest the date and time of its reception by him or her, and at the time appointed for the hearing shall present to the governing body all protests so filed.

(b) If assessments are to be levied, the protest procedures shall comply with Section 53753 of the Government Code.