California regulators have approved new limits on dairy manure pollution in the state's most dairy-dense valley, aiming to curb what officials describe as a disproportionate impact on groundwater. The unanimous vote by the State Water Resources Control Board came after a lengthy public hearing and years of pressure from environmental advocates.
The regulations impose stricter water quality requirements on dairy operations in the region, targeting the runoff and seepage of manure that has contaminated drinking water supplies. The board framed the move as a necessary step to address a long-neglected source of agricultural pollution.
Because this is a single source, there is no competing account to compare. The report emphasizes that the new rules are specifically designed to rein in the outsized groundwater footprint of dairy farming in the valley, though implementation details and timelines remain to be seen.