Section 75231 Of Article 4. Powers And Duties Of The Board From California Water Code >> Division 21. >> Part 7. >> Chapter 3. >> Article 4.

. The work of improvement for which the improvement district is formed, and the purchase of all necessary supplies, material, and equipment therefor, shall be performed and done by the district or, in the discretion of the board, bids may be received for such work and material; provided, however, that the cost thereof shall be paid only out of the improvement district assessment levied.