California adopts stricter rules for dairy manure pollution

California's water board unanimously approved new regulations limiting nitrogen pollution from dairy farms, addressing long-standing groundwater contamination in the state's largest dairy region.

First covered Sep 18, 2026 · 1:55 AM PT · 1 article · no longer in the live window

California adopts stricter rules for dairy manure pollution — Image via insideclimatenews.org

Coverage

8d Inside Climate News California Adopts New Limits to Rein in Dairy Manure Pollution and Its ‘Outsized’ Groundwater Impacts — The California valley with the most dairy farms in the state will follow stricter water pollution requirements following years of advocacy and a marathon…

Primary sources

cdfa.ca.gov 15 0454 Partialfr Harter (cdfa.ca.gov)

law.stanford.edu Robertson Et Al Caf Reporting And Permitting Under The Pca Final (law.stanford.edu)

waterboards.ca.gov Presentation In English (10 30 2024) (waterboards.ca.gov)

More coverage from around the web

mavensnotebook.com INSIDE CLIMATE NEWS: California water board will soon release a new rule to limit water pollution from dairies in the state ~ MAVEN'S NOTEBOOK | California Water News Central

western-water.com Groundwater Regs: California Orders New Dairy Nitrate Rules | Western Water

mavensnotebook.com INSIDE CLIMATE NEWS: California adopts new limits to rein in dairy manure pollution and its ‘outsized’ groundwater impacts ~ MAVEN'S NOTEBOOK | California Water News Central

mavensnotebook.com PRESS RELEASE: State Water Board adopts order to protect groundwater from overapplication of manure at dairies ~ MAVEN'S NOTEBOOK | California Water News Central

ww2.arb.ca.gov arb.ca.gov 1001 I Street • P.O. Box 2815 • Sacramento, California 95812

Appeared in: 2026-09-19 (#14)

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