California Code, Government Code - GOV § 61063

(a) Each district shall adopt policies and procedures, including bidding regulations, governing the purchasing of supplies and equipment not governed by Article 43 (commencing with Section 20680) of Chapter 1 of Part 3 of the Public Contract Code.  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.

(b) A district may request the State Department of General Services to make purchases of materials, equipment, or supplies on its behalf pursuant to Section 10298 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.

(d) A district may request the purchasing agent of the principal county to contract with persons to provide projects, services, and programs authorized by this division pursuant to Article 7 (commencing with Section 25500) of Chapter 5 of Division 2 of Title 3.