large white building with glass windows

San Mateo County Treasurer/Tax Collector, Sandie Arnott, an elected official, is charged with managing and protecting the County’s financial assets. She acts as the banker for the County and directs the investment of the County’s funds. The funds are invested in a portfolio of credit instruments called a pool. County Pool depositors include the County of San Mateo, elementary schools, high schools, community colleges and various other special districts and agencies within the County. It is the Treasurer’s mission to provide all pool participants with safety, liquidity and yield on their investments.


  • The Treasurer’s Office is open to the public from 9:00 AM - 5:00 PM, Monday through Friday (closed on holidays and departmental functions). Click this link for closure dates.


Recent Reports

Investment:        May 2024

Compliance:       June 2024

Absent Heirs:     June 2024

Closed RFP:       RFP for Operational Banking Services

Investment Reports Outgoing Wire Transfer Request Form for Pool Participants