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Phase II Small Municipal Separate Storm Sewer System (MS4) Program

Phase II Small MS4 Permit

On February 5, 2013, the State Water Board adopted the Phase II Small MS4 General Permit. Since 2013, the State Water Board adopted five amendments to this Permit. The links below provide the adopted permit, which incorporates all the adopted amendments. This combined Permit will remain marked "unofficial" until an Order number is assigned; however, the Permit, as amended, is fully in effect and enforceable.


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