Cal. Pub. Res. Code § 49160

No general obligation bonds shall be issued by the district unless the issuance thereof is approved by the electors of the district at a special election as provided in this article. If the district board finds that it is necessary to incur a bonded indebtedness to obtain funds with which to carry out the purposes of the district, it may submit the proposition to the voters of the district. For that purpose, a special election shall be called by resolution.