California Code, Family Code - FAM § 7660.5

Notwithstanding any other provision of law, a presumed father may waive the right to notice of any adoption proceeding by executing a form developed by the department before an authorized representative of the department, an authorized representative of a licensed public or private adoption agency, or a notary public or other person authorized to perform notarial acts. The waiver of notice form may be validly executed before or after the birth of the child, and once signed no notice, relinquishment for, or consent to adoption of the child shall be required from the father for the adoption to proceed. This shall be a voluntary and informed waiver without undue influence. If the child is an Indian child as defined under the Indian Child Welfare Act (ICWA),  1 any waiver of consent by an Indian presumed father shall be executed in accordance with the requirements for voluntary adoptions set forth in Section 1913 of Title 25 of the United States Code. The waiver shall not affect the rights of any known federally recognized Indian tribe or tribes from which the child or the presumed father may be descended to notification of, or participation in, adoption proceedings as provided by the ICWA. Notice that the waiver has been executed shall be given to any known federally recognized Indian tribe or tribes from which the child or the presumed father may be descended, as required by the ICWA.