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

April 26, 2017ms4 municipal permit separate sewer storm system

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What is the 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. This 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. Our MS4 permit was renewed for cities in San Diego County in 2001, will be renewed in Orange County in 2002, and is scheduled for renewal in Riverside County in 2003.