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What is an NPDES (National Pollutant Discharge Elimination System) permit?
The Clean Water Act prohibits anybody from discharging "pollutants" through a "point source" into a "water of the United States" unless they have an NPDES permit. The permit will contain limits on what you can discharge, monitoring and reporting requirements, and other provisions to ensure that the discharge does not hurt water quality or people's health. In essence, the permit translates general requirements of the Clean Water Act into specific provisions tailored to the operations of each person discharging pollutants.

Stormwater

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1. What is Stormwater?
2. Why is stormwater important?
3. What is an NPDES (National Pollutant Discharge Elimination System) permit?
4. What is a point source?
5. What is a water of the United States?
6. What is a pollutant?
7. Do I need an NPDES permit?
8. Where do I apply for an NPDES permit?
9. How are the conditions in NPDES permits enforced by EPA and the States?
10. Typically, how long are NPDEES permits effective?
11. What is the National Pollutant Discharge Elimination System (NPDES) Storm Water Program?
12. What is a Municipal Separate Storm Sewer System (MS4)?
13. Which MS4s are regulated by the NPDES Storm Water Program?