AB 639 California Assembly · 2025-2026 Regular Session

Dams: exceptions.

Summary
Existing law defines a dam to mean any artificial barrier, together with appurtenant works, that does or may impound or divert water, and meets other specified criteria. Existing law excludes from the definition a barrier that is or will be not in excess of 6 feet in height, regardless of storage capacity, or that has or will have a storage capacity not in excess of 15 acre-feet, regardless of height. Existing law requires the Department of Water Resources to supervise the construction, enlargement, alteration, repair, maintenance, operation, and removal of dams and reservoirs for the protection of life and property. This bill would additionally exclude from the definition of a dam a barrier that does not impound water above the top of a levee where maximum storage behind the barrier has a minimum of 3 feet of freeboard on the levee and is a weir, as defined, but would apply only to specified weirs named in the bill.
Bill status signed all 5 stages cleared
Introduction
Feb 2025
Committee Review
Jun 2025
Assembly Passage
Apr 2025
Senate Passage
Sep 2025
Signed into Law
Oct 2025
Introduced Feb 13, 2025 Signed Oct 11, 2025
Maddy AI version diff · 5 comparisons

What changed between versions

10/11/25 - Chaptered AB639 · 1 edit
MINOR
No substantive policy changes occurred between these two versions. The diff reflects a transition from the formal chaptered (enacted) document format to a web page rendering of the same bill text on the California Legislature website. All navigational elements, search tools, and UI components were added, while the official document header and formatting were removed.
TECHNICAL

The document changed from a formal chaptered legislative document (with STATE OF CALIFORNIA / AUTHENTICATED / ELECTRONIC LEGAL MATERIAL header) to a web page layout with navigation menus, search fields, bill tracking links, and version history. The underlying bill text - including all three subsections of Water Code Section 6003 - is substantively identical in both versions.

Floor votes · Senate Sep 3, 2025 · Assembly Apr 21, 2025

How they voted

381
Passed · 1 other
Total votes 40
Sep 3, 2025
D Democratic30
29 Yea 1 Nay
96% Yea
R Republican10
9 Yea 1
90% Yea
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
21
Key actions
9
Committee
6
Amendments
6
Oct 11, 2025
Signed into law
Approved by the Governor.
legislature
Sep 4, 2025
Lower · Passed
Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 78. Noes 0. Page 2918.).
lower
Sep 3, 2025
Introduced
In Assembly. Concurrence in Senate amendments pending.
lower
Sep 3, 2025
Upper · Passed
Read third time. Passed. Ordered to the Assembly. (Ayes 38. Noes 1. Page 2427.).
upper
Jun 23, 2025
Upper · Passed
From committee: Be ordered to second reading pursuant to Senate Rule 28.8.
upper
Jun 11, 2025
Upper · Passed
Read second time and amended. Re-referred to Com. on APPR.
upper
Jun 10, 2025
Introduced
From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 7. Noes 0.) (June 10).
upper
May 7, 2025
Committee
Referred to Com. on N.R. & W.
upper
Apr 21, 2025
Lower · Passed
Read third time. Passed. Ordered to the Senate. (Ayes 73. Noes 0. Page 1175.)
lower
Apr 9, 2025
Lower · Passed
From committee: Do pass. (Ayes 14. Noes 0.) (April 9).
lower
Apr 1, 2025
Committee
Re-referred to Com. on APPR.
lower
Mar 28, 2025
Lower · Passed
Read second time and amended.
lower
Mar 27, 2025
Introduced
From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 13. Noes 0.) (March 25).
lower
Feb 24, 2025
Committee
Referred to Com. on W. P., & W.
lower
Feb 14, 2025
Lower · Passed
From printer. May be heard in committee March 16.
lower
1 primary · 0 co-sponsors

Sponsors

Role
Legislator
Party
State
District
P
Photo of Esmeralda Soria
Esmeralda Soria
DDemocratic
CA
27