ORS 268.315

For the purpose of performing the functions set forth in ORS 268.310 (3), the district, when authorized at any properly called election held for such purpose, shall have the power to levy an ad valorem tax on all taxable property within its boundaries not to exceed in any one year one-half of one percent (0.005) of the real market value of all taxable property within the boundaries of such district, computed in accordance with ORS 308.207.