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What is a Municipal Separate Storm Sewer System (MS4) Permit?

April 26, 2017ms4 municipal permit separate sewer storm system

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What is a Municipal Separate Storm Sewer System (MS4) Permit?

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The Regional Board issues an MS4 permit in order to establish the conditions under which pollutants can be discharged from the storm drain system to local streams, coastal lagoons, and the Ocean. The MS4 permit implements requirements of the Clean Water Act and Federal NPDES stormwater regulations. Since 1990, permits have been issued to municipalities based on their county location. We have three MS4 permits in the San Diego Region. The permit for San Diego County (Order No. R9-2001-01) was renewed in 2001, the permit for Orange County (Order No. R9-2002-001) was renewed in 2002, and the permit for the portion of Riverside County within our region (Order No. R9-2004-001) was renewed in 2004.