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Headshot of Diane Papan

Diane Papan

Democrat, State Assembly
District 21, San Mateo
Time in office:
  • Assembly: 2022-present

News coverage of Diane Papan

Bio

Diane Papan’s family name has deep ties to the Assembly, though Papan herself is a relative newcomer. Her father, Lou Papan, was known as the “Dean of the Assembly” for the two decades he spent in the chamber. Papan earned a political science degree from UCLA and a law degree from the UC Hastings College of Law. Papan, 62, worked as an attorney and was mayor and city councilmember for the city of San Mateo. She chairs the Assembly Committee on Water, Parks, and Wildlife. She and her husband have one daughter.

Leader Badges

Environment Badge

Ideology

Left

Moderate

Right

Bill Activity

0

Of 35 bills:
4 Passed
9 Failed
22 Pending

For this session year, this legislator initiated 35 bills: 4 passed, 9 failed, and 22 are currently pending.

Alignment Meter

See all-time percentage of this legislator’s alignment with any organization based on total votes.

xx%votes: xx

Influence

There are three categories of donations to legislators after they are elected that encourage a working relationship between the donor and the legislator. The three categories are: 1-Gifts, 2-Travel, 3-Behests.

Giver
Value
Date
Description
Women in CA Leadership$46Dec 5, 2022plant/pin
Senator Bill Dodd$45Dec 6, 2022gift basket

Gifts

Legislators are not allowed to accept gifts of more than $10 per month from registered lobbyists. Gifts from any other single source are limited to $590 in a calendar year.

Gift Received Rating
#102/120

This legislator is ranked 102nd highest for the amount of personal gifts received.

Policy

Bills Authored by Diane Papan

AB 2033
Local Agency Public Construction Act: job order contracting: cities.

Committee: Assembly Standing Committee on Local Government

In Progress
Local Agency Public Construction Act: job order contracting: cities.Committee: Assembly Standing Committee on Local Government
AB 2088
Public Utilities: thermal energy networks.

Committee: Assembly Standing Committee on Utilities and Energy

In Progress
Public Utilities: thermal energy networks.Committee: Assembly Standing Committee on Utilities and Energy
AB 1772
Fish and wildlife: invasive mussels.

Committee: Assembly Standing Committee on Water, Parks, and Wildlife

In Progress
Fish and wildlife: invasive mussels.Committee: Assembly Standing Committee on Water, Parks, and Wildlife
ACR 151
Greek Independence Day.

Committee: Assembly Standing Committee on Rules

Passed
Greek Independence Day.Committee: Assembly Standing Committee on Rules
View All Bills

Committees

Most of the policy work in the state Capitol is done in “Standing” committees. Legislators also work on budget subcommittees. There are also “Special” and “Select” committees with a more narrow topic focus. And there are “Joint” committees with members from the Senate and Assembly.

Hearings

Featured Comments

Below are links to the video and transcript of recent, substantive comments by this legislator in committee hearings or floor sessions.

Preview image for AB 25952MIN
May 7, 2026

AB 2595

Vehicles: electric bicycles.

Preview image for AB 23803MIN
May 7, 2026

AB 2380

Pest control: registration fees.

Preview image for AB 252111MIN
Apr 23, 2026

AB 2521

California Council on Science and Technology: water availability study: Central Valley.

Preview image for AB 177218MIN
Apr 23, 2026

AB 1772

Fish and wildlife: invasive mussels.

Preview image for AB 246914MIN
Apr 22, 2026

AB 2469

Data centers: water use disclosures.

Preview image for AB 19317MIN
Apr 22, 2026

AB 1931

Insurance: home protection companies.

Preview image for AB 26199MIN
Apr 22, 2026

AB 2619

Water resources: data centers.

Preview image for AB 184923MIN
Apr 22, 2026

AB 1849

Decarbonized gaseous fuels.

Preview image for AB 20889MIN
Apr 22, 2026

AB 2088

Public Utilities: thermal energy networks.

Preview image for AB 22966MIN
Apr 22, 2026

AB 2296

Planning and zoning: housing element: regional housing needs allocation.

Preview image for AB 15579MIN
Apr 21, 2026

AB 1557

Vehicles: electric bicycles.

Preview image for AB 155732MIN
Apr 20, 2026

AB 1557

Vehicles: electric bicycles.

View All Hearings

District

View of map with yellow overlay for Assembly District 21 boundaries.
District 21 is a Safe Democratic District
Democratic Party candidate has a very high likelihood of winning in an election

Previous Election (2024):

Diane Papan
73.8%
WON
Mark Gilham
26.2%

Party Registration

Census Data

Median age0102030

Median age