What is an MS4?

MS4 = Municipal Separate Storm Sewer System

"A conveyance or system of conveyances owned by a State, City, Town, Village, or other public entity that discharges to the Waters of the United States and is designed or used to collect or convey stormwater (includes gutters, pipes, ditches)

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1. What is an MS4?
2. Who is in an MS4 permit area?
3. What is Stormwater?
4. Why should I care?