San Mateo County Board of Supervisors Study Session for SB 63 Transportation Tax: Assemblymember Papan’s Performance-based Funding Proposal Provides Better Accountability and Local Controls

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VIDEO. From the San Mateo County Board of Supervisors on Tuesday, August 12th, 2025 at 9:00am, as a hybrid meeting, with remote comment.  Agenda.  Staff Report for Item #10.
SamTrans Presentation. Caltrain Presentation.
Senator Scott Weiner and Assemblymember Diane Papan also joined the discussion.

VIDEO
Starts at 4:01:30
Study Session on SB 63: Regional Transportation Measure.


AI Overview (human checked). California Assemblymember Diane Papan has advocated for critical amendments to Senate Bill 63 (SB 63), a Bay Area regional transportation tax measure. While she supports solving the transit funding crisis, her central idea is to protect San Mateo County’s interests by ensuring local tax dollars include clear accountability, oversight, and tangible benefits for county residents. 

Diane Papan’s core ideas regarding SB 63

  • Accountability for tax dollars: Papan argues that the bill, in its current form, would send over $600 million in sales tax revenue from San Mateo County residents to large transit agencies like BART and Muni without sufficient local control. She wants to ensure that San Mateo taxpayers get a fair return on their investment.
  • Performance-based funding: Her proposal calls for performance-based funding to ensure that tax dollars support tangible benefits for San Mateo County residents, such as:
    • Clean, safe, and reliable service.
    • Coordinated schedules.
    • Equitable fare policies.
    • Local infrastructure investments.
  • Local oversight: A key demand is the creation of a San Mateo County oversight committee with real enforcement power. This body would be able to withhold funds from transit operators who provide subpar service or unfairly treat San Mateo County riders.
  • Protection against “blank checks”: Papan asserts that regional collaboration should not mean giving “blank checks” to other agencies. She believes that San Mateo County must have a seat at the table and the tools to hold agencies accountable for how local funds are spent. 

Context on SB 63 and San Mateo County

SB 63: Authored by State Senators Scott Wiener and Jesse Arreguín, SB 63 authorizes a half-cent sales tax in participating Bay Area counties to fund public transit. It is intended to address the structural deficits that major transit operators face following the pandemic.

San Mateo County’s decision: In August 2025, the San Mateo County Transit District (SamTrans) Board of Directors voted to join the regional measure, siding with other Bay Area counties.

Differing viewpoints: Though SamTrans opted in, the decision highlighted a rift among county leaders. While proponents emphasize the importance of regional collaboration to avoid catastrophic service cuts, Papan and others have voiced concerns about insufficient local control.

Path to passage: Because a measure placed on the ballot by a government body requires a two-thirds vote, the bill’s sponsors are pursuing a voter initiative. This would require only a simple majority (50% + 1) to pass, but would involve a lengthy and expensive signature-gathering process. The measure is anticipated to be on the ballot in November 2026


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