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Revised SB 88 rules set hourly reporting and mapping requirements for large diverters starting water year 2027

Delta Measurement Experimental Consortium (convened by Office of the Delta Watermaster / State Water Board) · December 2, 2025
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Summary

Officials summarized revisions to SB 88 measurement regulations adopted by the State Water Board and noted key changes: definition of large diversions ( >30 CFS or >10,000 acre-feet/year), required measurement frequency scaling up to hourly, submission through Cal Waters or approved sites, and a compliance timeline extending to water year 2027.

The State Water Board's revised SB 88 measurement regulations restructure timelines and clarify measurement expectations for larger water diversions, agency staff told the Delta Measurement Experimental Consortium.

The senior engineer from the Office of the Delta Watermaster said the Office of Administrative Law requested minor edits after adoption before regulations are filed in the California Code of Regulations. "There have been various comment periods on that," the engineer said, adding the net result is a later application date and clarified requirements.

Key elements: the regulations…

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