Fam. Code, § 8810

(a) Except as otherwise provided in this section, whenever a petition is filed under this chapter for the adoption of a child, the petitioner shall pay a nonrefundable fee to the department or to the delegated county adoption agency for the cost of investigating the adoption petition. Fifty percent of the payment shall be made to the department or delegated county adoption agency at the time the adoption petition is filed, and the remaining balance shall be paid no later than the date determined by the department or the delegated county adoption agency in an amount as follows:

(1) For petitions filed on and after October 1, 2008, four thousand five hundred dollars ($4,500).

(2) For petitioners who have a valid preplacement evaluation less than one year old pursuant to Section 8811.5, or a valid private agency adoption home study less than two years old at the time of filing a petition, one thousand five hundred fifty dollars ($1,550) for a postplacement evaluation pursuant to Sections 8806 and 8807.

(b) Revenues produced by fees collected by the department pursuant to subdivision (a) shall be used, when appropriated by the Legislature, to fund only the direct costs associated with the state program for independent adoptions. Revenues produced by fees collected by the delegated county adoption agency pursuant to subdivision (a) shall be used by the county to fund the county program for independent adoptions.

(c) The department or delegated county adoption agency may reduce the fee to no less than five hundred dollars ($500) when the prospective adoptive parents are lower income, according to the income limits published by the Department of Housing and Community Development, and when making the required payment would be detrimental to the welfare of an adopted child. The department shall develop additional guidelines regarding income and assets to determine the financial criteria for reduction of the fee under this subdivision.