As the custodian of County funds, the Treasurer invests with the objectives of legality, safety, liquidity and yield in mind. The Treasurer applies the "prudent investor" rule to manage the County's portfolio (i.e., investments are made with judgment and care, not for speculation but for investment, considering the probable safety of the County's financial resources as well as the income that can be derived). The Treasurer maintains a diverse portfolio consisting of certificates of deposit, money market accounts, government securities and other acceptable investments under Arizona law.

The Treasurer also serves as Public Trustee. All deeds of trust given to secure indebtedness of any kind name the Public Trustee as trustee. In that role, the Treasurer performs all functions and exercises all powers conferred upon her by the deed, whenever requested by the beneficiary or the legal holder of the indebtedness secured thereby, to make sales and/or to issue certificates of purchase, certificates of redemption or trustee's deeds as may be required and to release deeds of trust when requested by the beneficiary.