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AB-1413 • 2026

Sustainable Groundwater Management Act: groundwater adjudication.

Sustainable Groundwater Management Act: groundwater adjudication.

Education Water
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
Papan
Last action
2025-09-09
Official status
Ordered to inactive file at the request of Senator Wahab.
Effective date
Not listed

Plain English Breakdown

The official source material does not provide details on whether public comments are allowed or if there will be no reimbursement for local agencies. These points were removed as they lack supporting evidence from the provided sources.

Sustainable Groundwater Management Act: Groundwater Adjudication

The bill requires groundwater sustainability agencies to review and update their sustainable yield every seven years, sets timelines for legal challenges, and limits court authority in certain adjudications.

What This Bill Does

  • Requires groundwater sustainability agencies to review and update their sustainable yield every seven years based on the best available information and science.
  • Sets a timeline of 90 days for legal challenges against actions or determinations by groundwater sustainability agencies.
  • Limits court authority to establish a safe yield that exceeds what's set in valid groundwater sustainability plans after January 1, 2025.
  • Requires certain legal actions against groundwater sustainability agencies to be consolidated with comprehensive adjudications.

Who It Names or Affects

  • Groundwater sustainability agencies
  • Courts involved in groundwater management cases
  • Parties involved in comprehensive groundwater adjudications

Terms To Know

Sustainable Yield
The amount of water that can be taken from a groundwater basin without causing long-term harm to the basin.
Groundwater Sustainability Plan
A plan created by local agencies to manage and sustainably use groundwater resources in their area.

Limits and Unknowns

  • The bill does not specify a new effective date.
  • It is unclear how the changes will be implemented without an executive action or further legislative steps.

Bill History

  1. 2025-09-09 California Legislative Information

    Ordered to inactive file at the request of Senator Wahab.

  2. 2025-09-03 California Legislative Information

    Read second time. Ordered to third reading.

  3. 2025-09-02 California Legislative Information

    Read second time and amended. Ordered returned to second reading.

  4. 2025-09-02 California Legislative Information

    From committee: Amend, and do pass as amended. (Ayes 5. Noes 2.) (August 29).

  5. 2025-08-25 California Legislative Information

    In committee: Referred to suspense file.

  6. 2025-08-13 California Legislative Information

    In committee: Hearing postponed by committee.

  7. 2025-07-17 California Legislative Information

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

  8. 2025-07-17 California Legislative Information

    From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 10. Noes 3.) (July 15).

  9. 2025-07-09 California Legislative Information

    From committee: Do pass and re-refer to Com. on JUD. (Ayes 4. Noes 3.) (July 8). Re-referred to Com. on JUD.

  10. 2025-06-30 California Legislative Information

    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.

  11. 2025-06-18 California Legislative Information

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

  12. 2025-06-04 California Legislative Information

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

  13. 2025-06-03 California Legislative Information

    Read third time. Passed. Ordered to the Senate. (Ayes 45. Noes 21. Page 2021.)

  14. 2025-05-15 California Legislative Information

    Read second time. Ordered to third reading.

  15. 2025-05-14 California Legislative Information

    From committee: Do pass. (Ayes 10. Noes 4.) (May 14).

  16. 2025-04-30 California Legislative Information

    From committee: Do pass and re-refer to Com. on APPR. (Ayes 8. Noes 3.) (April 29). Re-referred to Com. on APPR.

  17. 2025-04-22 California Legislative Information

    In committee: Hearing postponed by committee.

  18. 2025-04-21 California Legislative Information

    Re-referred to Com. on JUD.

  19. 2025-04-10 California Legislative Information

    Read second time and amended.

  20. 2025-04-09 California Legislative Information

    From committee: Amend, and do pass as amended and re-refer to Com. on JUD. (Ayes 9. Noes 4.) (April 8).

  21. 2025-03-25 California Legislative Information

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

  22. 2025-03-24 California Legislative Information

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

  23. 2025-03-24 California Legislative Information

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

  24. 2025-02-24 California Legislative Information

    Read first time.

  25. 2025-02-22 California Legislative Information

    From printer. May be heard in committee March 24.

  26. 2025-02-21 California Legislative Information

    Introduced. To print.

Official Summary Text

AB 1413, as amended, Papan.
Sustainable Groundwater Management Act: groundwater adjudication.
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 requires the department to periodically review the groundwater sustainability plans developed by groundwater sustainability agencies pursuant to the act to evaluate whether a plan conforms with specified laws and is likely to achieve the sustainability goal for the basin covered by the plan. Existing
law requires a groundwater sustainability agency to evaluate its groundwater sustainability plan periodically.
This bill would require a groundwater sustainability agency to, at least once every 7 years, review, and update if appropriate, its sustainable yield to ensure that the sustainable yield is based on the best available information and best available science, as defined, and will achieve sustainable groundwater management. The bill would also require a groundwater sustainability agency to provide an opportunity for public review and comment before making a determination whether to update its sustainable yield. To the extent that these requirements impose additional duties on groundwater sustainability agencies that are local agencies, the bill would impose a state-mandated local program.
Existing
law authorizes a
groundwater sustainability agency that adopts a groundwater sustainability plan to file a court action to determine the validity of the plan no sooner than 180 days following the adoption of the plan, as provided. Existing law provides that actions by a groundwater sustainability agency are subject to judicial review, except as provided.
This bill would instead authorize groundwater sustainability agencies to file those actions within 180 days following the adoption of the plan. The bill would also authorize, for any groundwater basin in which a comprehensive groundwater adjudication was filed prior to January 1, 2025, a party that has timely appeared in that adjudication to file an action on or before March 2, 2026, under specified circumstances. The bill would require a legal challenge to an action or determination by the groundwater sustainability agency to be filed within 90 days of the action or determination.
Existing
law requires a court, in an adjudication action for a basin required to have a groundwater sustainability plan pursuant to the act, to manage the proceedings in a certain manner, including in a manner that minimizes interference with the timely completion and implementation of a groundwater sustainability plan.
The bill would prohibit a court, in an adjudication action
filed after January 1, 2025,
for a basin required to have a groundwater sustainability plan pursuant to the act, from establishing a safe yield or sustainable yield for the basin that exceeds the sustainable yield of the basin as established in a valid groundwater sustainability plan for the
basin.
basin, except as provided.
This prohibition would not apply to a comprehensive adjudication in which a court has issued a final determination on the basin’s safe or sustainable yield prior to January 1, 2026.
Existing law provides that an action against a groundwater sustainability agency that is located in a basin that is being adjudicated is subject to transfer, coordination, and consolidation with a comprehensive adjudication, as appropriate, if the action concerns the adoption, substance, or implementation of a groundwater sustainability plan, or the groundwater sustainability agency’s compliance with the timelines in the Sustainable Groundwater Management Act.
This bill would require an action against a groundwater sustainability agency that is located in a basin that is being adjudicated to be consolidated with a comprehensive adjudication if the action concerns the adoption,
substance, or implementation of a groundwater sustainability plan, or the groundwater sustainability agency’s compliance with the timelines in the Sustainable Groundwater Management Act. The bill would also require the court hearing the consolidated action to try the cause of action for judicial review of the groundwater sustainability plan’s determination of a basin’s sustainable yield before trying any other issue in the action.
Existing law authorizes a court to enter judgment in an adjudication action for a basin required to have a groundwater sustainability plan if, in addition to other criteria, the court finds the judgment will not substantially impair the ability of a groundwater sustainability agency, the State Water Resources Control Board, or the department to comply with the Sustainable Groundwater Management Act and to achieve sustainable groundwater management.
This bill, among other things, would provide that
a judgment substantially impairs the ability of those entities to comply with the act and to achieve sustainable groundwater management if it permits more total pumping from the basin annually or on average than the sustainable yield of the basin established in the latest groundwater sustainability plan or plans that have received a determination from the department that the plan or plans are likely to achieve the sustainability goal for the basin and have been validated by a final judgment or by operation of law when no validation action was filed.
The California Constitution requires the state to reimburse local agencies and school districts for certain costs mandated by the state. Statutory provisions establish procedures for making that reimbursement.
This bill would provide that no reimbursement is required by this act for
a specified reason.

Current Bill Text

Read the full stored bill text
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