A Phase II MS4 is any MS4 not already covered by the Phase I permit as a medium or large MS4. Phase II MS4s are designated if any parts or the entire MS4 is located in an urban area (UA) as defined by the U.S. Bureau of the Census (based on the latest decennial census).
Phase I large and medium MS4s were designated by EPA, based on the total population within the geo-political boundaries of the municipalities.
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