California Code, Welfare and Institutions Code - WIC § 14510

(a) The department shall include provisions in grants with all grantees that explicitly describe the requirements and restrictions of this chapter.

(b) The department shall establish a copayment system for services provided pursuant to this chapter. No person whose documented family income is at or below 100 percent of the federal poverty level shall be subject to copayments.

(c) The department shall require a grantee to obtain the signature of clients receiving services pursuant to this chapter on a document that, under penalty of perjury, acknowledges that the client meets and complies with the income eligibility requirements of this chapter.