(a) The board may impose a tax on all property in the district subject to district taxation.
(b) The tax shall be imposed for and may be pledged to:
(1) meet the requirements of district bonds and the indebtedness assumed by the district;
(2) provide for the district's maintenance and operating expenses, including the cost or contract payments for hospital care for needy district inhabitants; and
(3) make improvements and additions to the district's hospital facilities or hospital system and acquire necessary sites for those improvements and additions by gift, purchase, lease, or condemnation.
(c) The district may not impose a tax to pay the principal of or interest on revenue bonds issued under this chapter.