Cal. Public Resources Code § 5786.15

(a) Each district shall adopt policies and procedures, including bidding regulations, governing the purchase of supplies and equipment. Each district shall adopt these policies and procedures by rule or regulation pursuant to Article 7 (commencing with Section 54201) of Chapter 5 of Division 2 of Title 5 of the Government Code. (b) A district may request the Department of General Services to make purchases of materials, equipment, or supplies on its behalf pursuant to Section 10324 of the Public Contract Code. (c) A district may request the purchasing agent of the principal county to make purchases of materials, equipment, or supplies on its behalf, pursuant to Article 7 (commencing with Section 25500) of Chapter 5 of Division 2 of Title 3 of the Government Code. (d) A district may request the purchasing agent of the principal county to contract with persons to provide recreation facilities and programs of community recreation, pursuant to Article 7 (commencing with Section 25500) of Chapter 5 of Division 2 of Title 3 of the Government Code. The district shall be responsible for and maintain control over those recreational facilities and programs of community recreation. (e) A district may lease or rent private vehicles or equipment owned by district employees.