AB 1466

  • California Assembly Bill
  • 2025-2026 Regular Session
  • Introduced in Assembly Feb 21, 2025
  • Passed Assembly Jun 04, 2025
  • Passed Senate Sep 10, 2025
  • Signed by Governor Oct 11, 2025

Groundwater adjudication.

Bill Subjects

Groundwateradjudication

Abstract

(1) Existing law establishes procedures for the comprehensive adjudication of groundwater rights in civil court. Under existing law, if the court finds that claims of right to extract or divert only minor quantities of water, as defined, would not have a material effect on the groundwater rights of other parties, the court may exempt those claimants from the proceedings, except as specified. Existing law further prescribes that a judgment in a comprehensive adjudication to determine rights to extract groundwater in a basin is not binding on, among others, claimants whose claims have been exempted. This bill would authorize a court, in lieu of the exemption process described above, to treat persons with claims of right to extract or divert only minor quantities of water separately from other parties to the comprehensive adjudication. The bill would require the court to hold a hearing within a specified time to determine whether to exempt or treat those claimants separately and to establish a procedure to register and administer such claims. (2) Existing law, in a comprehensive adjudication of groundwater rights in civil court, requires a party to serve on the other parties and the special master, if appointed, an initial disclosure that includes certain information within six months of the party's appearance in a comprehensive adjudication, except as specified. Existing law requires that information to include a description of the general purpose for which the groundwater has been used and the area in which the groundwater has been used. This bill would require the court to presume the accuracy of the facts asserted by a party in the initial disclosure described above if the party claims an annual extraction of not more than 100 acre-feet of water. The bill would provide that a party who challenges the facts asserted in an initial disclosure that qualifies for this presumption has the burden of proving the inaccuracy of those facts. The bill would, if the groundwater has been used for an agricultural use, require the initial disclosure to include information regarding the type of crops grown and the number of acres irrigated during the preceding 10 years. (3) Existing law, the Sustainable Groundwater Management Act, requires all groundwater basins designated as high- or medium-priority basins by the Department of Water Resources to be managed under a groundwater sustainability plan or coordinated groundwater sustainability plans, except as specified. Existing law authorizes any local agency or combination of local agencies overlying a groundwater basin to decide to become a groundwater sustainability agency for that basin and imposes specified duties upon that agency or combination of agencies, as provided. This bill would require the court to, in any adjudication in a basin where one or more groundwater sustainability agencies have adopted a groundwater sustainability plan that has been approved by the department, request that the groundwater sustainability agency provide a technical report, to the extent that the agency is able to do so at a reasonable effort and expense. The bill would require such a report to, at a minimum, quantify and describe the groundwater use of parties that have not otherwise appeared before the court, as provided. The bill would provide for the payment or reimbursement of costs related to the technical report, as provided. The bill would permit the court during the pendency of the report to award interim or partial payments to be made by the parties, upon a motion with proper notice, as specified, by a groundwater sustainability agency, and following a hearing. The bill would provide that the technical report shall be prima facie evidence of the physical facts found in the report, as provided.

Bill Sponsors (1)

Votes


Actions


Oct 11, 2025

California State Legislature

Approved by the Governor.

California State Legislature

Chaptered by Secretary of State - Chapter 643, Statutes of 2025.

Sep 23, 2025

California State Legislature

Enrolled and presented to the Governor at 4 p.m.

Sep 11, 2025

Assembly

Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 69. Noes 1. Page 3331.).

Sep 10, 2025

Assembly

In Assembly. Concurrence in Senate amendments pending.

Senate

Read third time. Passed. Ordered to the Assembly. (Ayes 35. Noes 5. Page 2823.).

Sep 08, 2025

Senate

Read second time. Ordered to third reading.

Sep 04, 2025

Senate

Read third time and amended. Ordered to second reading.

Aug 26, 2025

Senate

Read second time. Ordered to third reading.

Aug 25, 2025

Senate

From committee: Be ordered to second reading pursuant to Senate Rule 28.8.

Aug 13, 2025

Senate

In committee: Hearing postponed by committee.

Jul 17, 2025

Senate

Read second time and amended. Re-referred to Com. on APPR.

  • Amendment-Passage
  • Reading-1
  • Reading-2
  • Referral-Committee
Com. on APPR.

Jul 16, 2025

Senate

From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 11. Noes 2.) (July 15).

Jul 09, 2025

Senate

From committee: Do pass and re-refer to Com. on JUD. (Ayes 5. Noes 2.) (July 8). Re-referred to Com. on JUD.

  • Committee-Passage
  • Committee-Passage-Favorable
  • Referral-Committee
Com. on JUD.

Jun 26, 2025

Senate

From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on N.R. & W.

  • Amendment-Introduction
  • Amendment-Passage
  • Reading-1
  • Reading-2
  • Referral-Committee
Com. on N.R. & W.

Jun 18, 2025

Senate

Referred to Coms. on N.R. & W. and JUD.

  • Referral-Committee
Coms. on N.R. & W. and JUD.

Jun 05, 2025

Senate

In Senate. Read first time. To Com. on RLS. for assignment.

Jun 04, 2025

Assembly

Read third time. Passed. Ordered to the Senate. (Ayes 50. Noes 20. Page 2074.)

May 08, 2025

Assembly

Read second time. Ordered to third reading.

May 07, 2025

Assembly

From committee: Do pass. (Ayes 11. Noes 4.) (May 7).

Apr 22, 2025

Assembly

From committee: Do pass and re-refer to Com. on APPR. (Ayes 9. Noes 3.) (April 22). Re-referred to Com. on APPR.

  • Committee-Passage
  • Committee-Passage-Favorable
  • Referral-Committee
Com. on APPR.

Apr 09, 2025

Assembly

From committee: Do pass and re-refer to Com. on JUD. (Ayes 9. Noes 4.) (April 8). Re-referred to Com. on JUD.

  • Committee-Passage
  • Committee-Passage-Favorable
  • Referral-Committee
Com. on JUD.

Apr 02, 2025

Assembly

Re-referred to Com. on W. P., & W.

  • Referral-Committee
Com. on W. P., & W.

Apr 01, 2025

Assembly

From committee chair, with author's amendments: Amend, and re-refer to Com. on W. P., & W. Read second time and amended.

Mar 17, 2025

Assembly

Referred to Coms. on W. P., & W. and JUD.

  • Referral-Committee
Coms. on W. P., & W. and JUD.

Feb 24, 2025

Assembly

Read first time.

Feb 22, 2025

Assembly

From printer. May be heard in committee March 24.

Feb 21, 2025

Assembly

Introduced. To print.

Bill Text

Bill Text Versions Format
AB1466 HTML
02/21/25 - Introduced PDF
04/01/25 - Amended Assembly PDF
06/26/25 - Amended Senate PDF
07/17/25 - Amended Senate PDF
09/04/25 - Amended Senate PDF
09/15/25 - Enrolled PDF
10/11/25 - Chaptered PDF

Related Documents

Document Format
04/04/25- Assembly Water, Parks and Wildlife PDF
04/17/25- Assembly Judiciary PDF
05/05/25- Assembly Appropriations PDF
05/09/25- ASSEMBLY FLOOR ANALYSIS PDF
07/03/25- Senate Natural Resources and Water PDF
07/11/25- Senate Judiciary PDF
08/26/25- Sen. Floor Analyses PDF
09/09/25- Sen. Floor Analyses PDF
09/10/25- ASSEMBLY FLOOR ANALYSIS PDF

Sources

Data on Open States is updated periodically throughout the day from the official website of the California State Legislature.

If you notice any inconsistencies with these official sources, feel free to file an issue.