What is being done about stormwater?

In 1987 Congress amended the Clean Water Act to require the U.S. EPA to establish requirements for storm water discharges. Phase I Stormwater regulations began in 1992 followed by Phase II in 2003.  Phase I regulates industrial activity and municipal separate storm sewer systems (MS4s) with populations of 100,000 or more.  Phase II regulates MS4s serving populations less than 100,000 and construction activities.

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1. What Is Stormwater?
2. Why are we concerned about stormwater?
3. What is being done about stormwater?