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California Water Law & Policy Reporter

April 2026

Volume 36, Number 7 April 2026

CALIFORNIA WATER NEWS

Delta-Mendota Moves Back from the Brink: California Staff Finds Revised Groundwater Plan Sufficient to Avoid Probation149

REGULATORY DEVELOPMENTS

Department of Water Resources Releases Final Land Subsidence Best Management Practices: Key Regulatory Shifts and Liability Expansions for Groundwater Sustainability Agencies152

State Water Resources Control Board to Consider Exempting Pumpers of Less than 20 Acre-Feet per Year in Probationary Basins from Reporting and

Fees153

LAWSUITS FILED OR PENDING

Environmental Groups File Lawsuit Challenging Trump Administration’s Implementation of ‘Action 5’ Plan for the Central Valley Project156

Conservationists and Tire Manufactures Argue Sufficiency of Evidence That 6PPD From Tires Results in Toxic Runoff into Surface Waters157

RECENT FEDERAL DECISIONS

Circuit Court of Appeals:

Ninth Circuit Court Invalidates 2016 EPA Cadmium Recommendation for Violation of Federal Endangered Species Act159

Center for Biological Diversity v. U.S. Environmental Protection Agency, ___F.4th___, Case No. 23-2946 (9th Cir. Mar. 3, 2026).

District Court:

U.S. District Court Affirms CWA Notice of Violation Letters Need Only Be ‘Reasonably Specific’ to Sufficiently Allert Violator of Unlawful

Discharge161

Californians for Alternatives to Toxics v. Travis Moreda Dairy, ___F.Supp.4th___, Case No. 24-CV-06632-SI (N.D. Cal. Jan. 27, 2026).

RECENT CALIFORNIA DECISIONS

Supreme Court:

California Supreme Court Declines Review of

Challenge to SWRCB’s Probationary Determination for the Tulare Lake Subbasin163

State Water Resources Control Board v. Superior Court Kings County, ___Cal.App.5th___, Case No. F088909 (5th Dist. Oct. 29, 2025).

District Court of Appeal:

Fourth District Court Finds Complaint in Enforcement Action Adequately Alleged Claims under

California’s Safe Drinking Water Act165

Environmental Health Advocates, Inc. v. Pancho Villa’s, Inc., ___Cal.App.5th___, Case No. D084705 (4th Dist. Feb. 20, 2026).

Las Posas Groundwater Adjudication Affirmed:

Second District Court Endorses Comprehensive

Basin Management Framework167

Las Posas Valley Water Rights Coalition v. Ventura County Waterworks District No. 1 et al., ___Cal.App.5th___, Case No. B330837(2nd Dist. Mar. 5, 2026).

‘Water, No Invite’? Fifth District Court Finds City of Fresno May Be Liable for Property Damage Caused by Switch to Alternate Water Source169

Micheli v. City of Fresno, Unpub., Case No. F085599 (5th Dist. Feb. 13, 2026).