The department shall be the sole judge of:
(a) The legality or validity of taxes, assessments, charges, or encumbrances, and the amount necessary to be paid in satisfaction or discharge thereof.
(b) The amount of insurance to be placed upon the buildings, fences, other permanent improvements, and crops and the amount necessary to be paid for the premiums for such insurance.
(c) The necessity and nature of the work necessary to keep the buildings, fences, and other improvements in good order and repair, and the amount necessary to be paid therefor.
(Amended by Stats. 1947, Ch. 328.)