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NPDES Stormwater Program

Program for Regulated Phase II MS4s

A Regulated Phase II MS4 is any MS4 not already covered by the Phase I Program as a medium or large MS4. The MS4s is automatically designated if any parts or the entire MS4 is located in an urbanized area boundaries as defined by the U.S. Bureau of the Census (based on the latest decennial census). An urbanized area (UA) is a central place (or places) and the adjacent densely surrounding territory that together has a minimum residential population of 50,000 and a minimum average density of 1,000 people/square mile.


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