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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 22 bills:
4 Passed
6 Failed
12 Pending

For this session year, this legislator initiated 22 bills: 4 passed, 6 failed, and 12 are currently pending.

Alignment Meter

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

xx%votes: xx

Financials

This feature tracks three sources of money intended to help a candidate win election: 1-Money given directly to a candidate’s committee, 2-Money given to an Independent Expenditure Committee, 3-Money given to a political party. (NOTE: Senators are elected every four years. Twenty of the 40 Senators are on the ballot in even-numbered years, so Senators may do little or no fundraising in the first two-year session of their Senate term).

Election

This display shows money given directly to the incumbent’s campaign committee (NOTE: The industry categories for donors come from Open Secrets, a nonpartisan research organization for campaign finance. Some contributions are “uncoded,” meaning they have not been assigned to an industry sector. As a result, the total for each sector is also an estimate).

Agriculture

$16.4K

Communications & Electronics

$27.1K

Construction

$15.0K

Energy & Natural Resources

$36.5K

Finance, Insurance & Real Estate

$92.5K

General Business

$119.4K

Government Agencies/Education/Other

$38.5K

Health

$97.3K

Ideology/Single Issue

$27.2K

Labor

$204.4K

Lawyers & Lobbyists

$20.6K

Party

$150.0

Transportation

$14.5K

Uncoded

$166.6K

Unitemized Contributions

$128.6K

Candidate Donations

Individuals, corporations, organizations and committees are limited to a maximum donation to candidates of $5,500 for the primary and for the general elections.

Total
$1.0M

112.0% higher than the average legislators

Independent Expenditures

Money from Independent Expenditure Committees (IEC) for advertising or grassroots activity targeting a candidates run for office is unlimited, but it cannot be spent in coordination with the candidate or the candidate's campaign.

Total
$37.6K

58.0% lower than the average legislators

Grand Total for Elections

$1.0M

85.0% higher than the average legislators

This is a total of the money targeting this legislator's campaign(s) including direct donations to the candidate, money spent by Independent Expenditure Committees and money from political parties.


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.

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 5012MIN
Jan 29, 2026

AB 501

Lawsuits, liens, and other encumbrances.

Preview image for AB 65059SEC
Sep 11, 2025

AB 650

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

Preview image for AB 932MIN
Sep 11, 2025

AB 93

Water resources: data centers.

Preview image for AB 12501MIN
Sep 10, 2025

AB 1250

Transit operators: paratransit: recertification of eligibility.

Preview image for AB 5271MIN
Sep 10, 2025

AB 527

California Environmental Quality Act: geothermal exploratory projects: geothermal field development projects: enhanced...

Preview image for AB 601MIN
Sep 9, 2025

AB 60

Cosmetic safety.

Preview image for AB 41141SEC
Sep 9, 2025

AB 411

Livestock carcasses: disposal: composting.

Preview image for AB 90058SEC
Sep 4, 2025

AB 900

Environmental protection: 30x30 goals: land conservation: stewardship.

Preview image for AB 937MIN
Jul 16, 2025

AB 93

Water resources: data centers.

Preview image for AB 41123MIN
Jul 16, 2025

AB 411

Livestock carcasses: disposal: composting.

Preview image for AB 52729MIN
Jul 16, 2025

AB 527

California Environmental Quality Act: geothermal exploratory projects: geothermal field development projects: enhanced...

Preview image for AB 141315MIN
Jul 15, 2025

AB 1413

Sustainable Groundwater Management Act: groundwater adjudication.

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