The California State Penal Code states that it is illegal for anyone under 18 years of age to be pierced. However, minors may be pierced with their parent or legal guardian present.
Exceptions to the state penal code are that emancipated minors can be pierced, and a person of any age may get pierced ears. Minors can't get piercings in either the nipples or genital area.
Proper documentation is required for minors to get piercings. This documentation may consist of photo identification for all parties involved, court papers showing emancipation or guardianship, divorce or separation papers if the minor's last name doesn't match the parent's or a marriage license if the person to get pierced is married but under the age of 18 are required at the time of piercing.