Section 18.56.190 - Tax exemption(a) The exercise of the powers granted by this chapter will be in all respects for the benefit of the people of the state, for their well-being and prosperity, and for the improvement of their social and economic conditions, and the corporation is not required to pay a tax or assessment on any property owned by the corporation under the provisions of this chapter or upon the income from it, except taxes on real property of which the corporation is fee owner.(b) All obligations issued under this chapter are declared to be issued by a body corporate and public of the state and for an essential public and governmental purpose, and the obligations, and the interest and income on and from the obligations, and all fees, charges, funds, revenues, income, and other money pledged or available to pay or secure the payment of the obligations, or interest on the obligations, are exempt from taxation except for transfer, inheritance, and estate taxes.