AB 399 California Assembly · 2025-2026 Regular Session

Coastal resources: coastal development permits: blue carbon demonstration projects.

Summary
Existing law, the California Coastal Act of 1976, among other things, requires anyone wishing to perform or undertake any development in the coastal zone, except as specified, in addition to obtaining any other permit required by law from any local government or from any state, regional, or local agency, to obtain a coastal development permit from the California Coastal Commission or local government, as provided. This bill, upon appropriation, would authorize the commission to authorize blue carbon demonstration projects, as defined, in order to demonstrate and quantify the carbon sequestration potential of these projects to help inform the state's natural and working lands and climate resilience strategies. The bill, upon appropriation, would, among other things, authorize the commission to require an applicant with a nonresidential project that impacts coastal wetland, subtidal, intertidal, or marine habitats or ecosystems to build or contribute to a blue carbon demonstration project as mitigation for those impacts.
Bill status vetoed 4 of 5 stages cleared
Introduction
Feb 2025
Committee Review
Jul 2025
Assembly Passage
Jun 2025
Senate Passage
Sep 2025
Vetoed
Oct 2025
Introduced Feb 4, 2025 Vetoed Oct 1, 2025
Maddy AI version diff · 4 comparisons

What changed between versions

09/10/25 - Enrolled AB399 · 1 edit
MINOR
No substantive policy changes occurred between these two versions. The diff reflects a conversion of AB 399 from its formal enrolled bill document format (with chapter number, signature blocks, and page numbering) to a web-based rendering on the California Legislature website. The actual legislative text - including all findings, definitions, and operative provisions regarding blue carbon demonstration projects - is identical in both versions.
TECHNICAL

The document was reformatted from an official enrolled bill layout (with chapter number placeholder, page numbers, signature/approval blocks, and formal header) to a web page presentation with navigation menus, search tools, version history, and status tracking. No changes to the bill's substantive content.

Floor votes · Senate Sep 4, 2025 · Assembly Jun 2, 2025

How they voted

2910
Passed · 1 other
Total votes 40
Sep 4, 2025
D Democratic30
29 Yea 1
96% Yea
R Republican10
10 Nay
100% Nay
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
24
Key actions
8
Committee
7
Amendments
6
Jan 22, 2026
Vetoed
Consideration of Governor's veto stricken from file.
lower
Oct 1, 2025
Vetoed
Consideration of Governor's veto pending.
lower
Oct 1, 2025
Vetoed
Vetoed by Governor.
lower
Sep 8, 2025
Lower · Passed
Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 58. Noes 18. Page 3025.).
lower
Sep 4, 2025
Introduced
In Assembly. Concurrence in Senate amendments pending.
lower
Sep 4, 2025
Upper · Passed
Read third time. Passed. Ordered to the Assembly. (Ayes 29. Noes 10. Page 2519.).
upper
Aug 29, 2025
Upper · Passed
Read second time and amended. Ordered returned to second reading.
upper
Aug 29, 2025
Introduced
From committee: Amend, and do pass as amended. (Ayes 5. Noes 2.) (August 29).
upper
Jul 7, 2025
Committee
In committee: Referred to APPR. suspense file.
upper
Jun 25, 2025
Upper · Passed
Read second time and amended. Re-referred to Com. on APPR.
upper
Jun 24, 2025
Introduced
From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 5. Noes 2.) (June 24).
upper
Jun 11, 2025
Committee
Referred to Com. on N.R. & W.
upper
Jun 2, 2025
Lower · Passed
Read third time. Passed. Ordered to the Senate. (Ayes 54. Noes 18. Page 1825.)
lower
May 23, 2025
Lower · Passed
From committee: Do pass. (Ayes 11. Noes 3.) (May 23).
lower
Apr 9, 2025
Committee
In committee: Set, first hearing. Referred to APPR. suspense file.
lower
Mar 25, 2025
Lower · Passed
From committee: Do pass and re-refer to Com. on APPR. (Ayes 9. Noes 3.) (March 24). Re-referred to Com. on APPR.
lower
Feb 18, 2025
Committee
Referred to Com. on NAT. RES.
lower
Feb 5, 2025
Lower · Passed
From printer. May be heard in committee March 7.
lower
1 primary · 3 co-sponsors

Sponsors