Okla. Stat. tit. 19, § 19-902.16: Additional assessments - Calling of election

A. The board may also levy an additional annual assessment

sufficient to care for the cost of operation of the district and the

maintenance of its roads, equipment and for payment of the salaries

of employees of the district, provided that no such annual

assessment for operations, maintenance and salaries shall exceed

three (3) mills on the dollar of the assessed valuation of the

property in the district.

B. The board may call an election of the registered voters of

the district, or if there are no registered voters of the district,

the owners of real property in the district who are registered

voters, in the manner provided for in Section 902.12 of this title,

to determine whether or not the board shall levy an annual

assessment not to exceed three (3) mills on the dollar of the

assessed valuation of the property in the district for the purpose

of providing additional funds for the operation of the district, the

maintenance of its roads, equipment and salaries of the employees of

the district. Such annual assessment shall be in addition to the

annual assessment provided for in subsection A of this section. The

number of mills shall be set forth in the resolution calling the

election and, if approved, shall remain in effect until increased or

decreased in a later election called in the manner provided for in

Section 902.12 of this title, but the total additional annual levy

shall not exceed three (3) mills.