Does my construction site require a Stormwater Plan Approval from Maricopa County?
If your construction site is located in the Urbanized Area of Unincorporated Maricopa County and will disturb one or more acres, or is less than one acre but is part of a larger plan of development, Stormwater Plan approval by Maricopa County is required prior to the start of land disturbance. Urbanized Area of Unincorporated Maricopa (PDF)

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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?