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Water Boards staff to consider splitting wastewater and MS4 stormwater matrices after debate on whether MS4 is "effluent"
Summary
Tessa proposed adding municipal separate storm sewer system (MS4) discharges to the effluent matrix to group point-source permitted discharges; some attendees questioned whether MS4 is properly treated as effluent rather than runoff.
Tessa presented a proposal to update the effluent matrix description to explicitly include MS4 stormwater discharge, saying permitting staff advised that the intent was to distinguish point-source discharges covered by NPDS permits. "MS 4 stormwater is considered effluent, and so it belongs in the effluent description," she said, adding that including MS4 in effluent lets staff distinguish routine surface-water monitoring from…
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