The commissioners may levy for the purposes of the authority a tax of not more than 1/4 mill upon each dollar of the assessed value of the property of the district. The board shall ascertain the total taxes or appropriation required for any year and shall thereupon certify to the board of supervisors of each county comprising the district the necessary tax rate to raise such amount, which shall be uniform in the district, and shall take into consideration the ratio that the total assessed valuation of each respective county bears to the total assessed value of all property, real and personal in said entire district according to the last assessment in each of said respective counties. All taxes shall be assessed, levied, collected and returned as county taxes under the general property tax law. All moneys collected by any tax collecting officer from the tax levied under the provisions of this section shall be transmitted to the authority to be disbursed as provided in this act.

     The subjects of taxation for the district purposes shall be the same as for state, county, and school purposes under the general law.