2005 California Health and Safety Code Sections 101375-101380 Article 2. County Health Administration for Cities

101375.  When the governing body of a city in the county consents by
resolution or ordinance, the county health officer shall enforce and
observe in the city all of the following:
   (a) Orders and quarantine regulations prescribed by the department
and other regulations issued under this code.
   (b) Statutes relating to the public health.
101380.  The resolution or ordinance shall be adopted and a
certified copy served on the clerk of the board of supervisors on or
before the first day of March of any year, and the services of the
county health officer in the city shall commence on the first day of
July following service of notice.  The services shall continue
indefinitely until the governing body of the city terminates them by
adoption of a resolution and ordinance and service of a certified
copy on the clerk of the board of supervisors on or before the first
day of March of any subsequent year.  The services of the county
health officer shall terminate on the first day of July following
service of notice.