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Council proposes a separate 'stormwater' matrix and guidance for wet/dry sampling

California Water Quality Monitoring Council user group · December 11, 2025
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

Staff proposed adding a distinct 'stormwater' matrix to separate MS4/permit-regulated effluent samples from ambient surface-water monitoring; participants urged recording wet vs. dry conditions and staff said SEEDin2 will add a wet/dry field and guidance will be added to sample comments.

At the December user-group meeting, staff proposed creating a separate "stormwater" matrix to distinguish permit-regulated point-source stormwater effluents (MS4, industrial, construction) from ambient surface-water samples used for integrated reporting.

"We're just calling the matrix name stormwater," database manager Tessa Foggitt said, explaining that the change will make it easier to exclude stormwater effluent…

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