California Code, Public Resources Code - PRC § 5786.11

(a) A district may cooperate with any city, county, special district, school district, state agency, or federal agency to carry out the purposes and intent of this chapter.  To that end, a district may enter into agreements with those other public agencies to do any and all things necessary or convenient in carrying out the purposes and intent of this chapter.

(b) A district may jointly acquire, construct, improve, maintain, and operate recreation facilities and programs of community recreation with any other public agency.  Nothing in this chapter shall be construed to prohibit any joint or cooperative action with other public agencies.