What is stormwater runoff?
Stormwater runoff is the water that runs off surfaces, such as rooftops, paved streets, highways, parking lots, and the desert itself. It can also come from hard grassy surfaces, such as golf courses, lawns, parks, and play fields.

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1. What is the Stormwater Program?
2. What is the Arizona Pollutant Discharge Elimination System (AZPDES) program?
3. What is stormwater runoff?
4. What is an MS4 system?
5. Why is stormwater regulated?
6. Does my construction site require a Stormwater Plan Approval from Maricopa County?
7. Do I require a Post-Construction Permit from Maricopa County?
8. How do I apply for Stormwater Plan Approval?
9. What is the National Pollutant Discharge Elimination System (NPDES) program?