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PRMD Adopts New NPDES/MS4 Boundary

Published:  July 9, 2014

As of July 2014, the Sonoma County Permit & Resource Management Department (PRMD) has adopted a new National Pollutant Discharge Elimination System (NPDES) boundary. The boundary will be used to determine areas subject to special NPDES storm water requirements to improve water quality. In particular this boundary will assist in determining where low impact development post-construction best management practices (LID BMPS) are required to improve water quality. In addition, the map is a requirement of the North Coast Region Water Quality Control Board, Santa Rosa, in order for the County of Sonoma to reapply for coverage to discharge storm water from local Municipal Separate Storm Sewer System (MS4) into waters of the State as part of the NPDES Phase 1, Term 4 permit renewal. For more information, refer to NPDES Information.

NPDES Boundary Map

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