2010 California Code
Government Code
Article 3. County Contract Services

51350.  A county which provides services through its appropriate
departments, boards, commissions, officers or employees, to any city
pursuant to contract or as authorized by law, shall charge the city
all those costs which are incurred in providing the services so
contracted or authorized. A county shall not charge a city
contracting for a particular service, either as a direct or an
indirect overhead charge, any portion of those costs which are
attributable to services made available to all portions of the
county, as determined by resolution of the board of supervisors, or
which are general overhead costs of operation of the county
government. General overhead costs, for the purpose of this section,
are those costs which a county would incur regardless of whether or
not it provided a service under contract to a city.
   Any determination of general overhead costs shall be subject to
court review as to the reasonableness of such determination.
   This section does not apply to a contract or agreement in effect
on December 31, 1983, made by a county.