Cal. Welf. & Inst. Code § 207
(b) A minor taken into custody upon the ground that the minor is a person described in Section 601, or adjudged to be a ward of the juvenile court solely upon that ground, may be held in a secure facility, other than a facility in which adults are held in secure custody, in any of the following circumstances:
(e) Every county shall keep a record of each minor detained under subdivision (b), the place and length of time of the detention, and the reasons why the detention was necessary. Every county shall report this information to the Board of State and Community Corrections on a monthly basis, on forms to be provided by that agency.
The board shall not disclose the name of the detainee, or any personally identifying information contained in reports sent to the Division of Juvenile Justice under this subdivision.