California Code, Public Resources Code - PRC § 9417

(a) The directors of any district may cooperate with the directors of any other district in respect to matters of common interest or benefit to the districts.  An association of resource conservation districts may be organized to facilitate that cooperation, to provide for the loan of equipment and tools by one district to another, and for the making of investigations and studies and the carrying out of projects of joint interest to the districts participating therein.

(b) It is the intent of the Legislature to encourage districts to organize in countywide or regional associations for the purposes of (1) providing coordinated representation of districts before federal, state, and local governmental agencies and (2) coordinating program planning, funding, and delivery of services.