“City” or “county” includes a city and county and also includes any agency created by a joint powers agreement under Article 1 (commencing with Section 6500) of Chapter 5 of Division 7 of Title 1 of the Government Code entered into by cities or counties, or both, for the express purpose of the joint exercise of their powers under this part.
Source:
Section 52011.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=52011.5..