Grading & Drainage: Phoenix vs Tempe
How do grading & drainage rules compare between Phoenix, AZ and Tempe, AZ?
Phoenix and Tempe have similar restriction levels.
Phoenix, AZ
Maricopa County
Phoenix City Code Chapter 32A establishes grading and drainage permit requirements. Plans must show property limits, existing contours, proposed drainage channels, and provisions for on-site stormwater retention. A SWPPP is required for construction per state and federal regulations. The Stormwater Policies and Standards Manual provides detailed design criteria.
View full Phoenix rules →Tempe, AZ
Maricopa County
Tempe requires grading and drainage permits for projects that alter the natural grade of land. The city's engineering standards ensure proper stormwater management and prevent drainage problems to adjacent properties. Tempe participates in the Flood Control District of Maricopa County programs. Development must retain stormwater on-site for certain storm events.
View full Tempe rules →Key Facts Comparison
| Fact | Phoenix | Tempe |
|---|---|---|
| Code Chapter | Phoenix City Code Chapter 32A | - |
| Permit Section | §32A-9 | - |
| SWPPP | Required per state/federal regulations | - |
| Retention | On-site stormwater retention required | On-site stormwater retention required |
| Design Standards | Chapter 6, Stormwater Policies Manual | - |
| Permit | - | Required for projects altering natural grade |
| Drainage Reports | - | Required for significant development |
| Flood Plain | - | Salt River and Indian Bend Wash corridors |
| County Program | - | Flood Control District of Maricopa County |
| Indian Bend Wash | - | Major flood control and recreation corridor |
Highlighted rows indicate differences between cities.
Phoenix FAQ
When is a grading and drainage permit required?
A permit under Chapter 32A is required for construction projects that alter existing grade or drainage patterns. Plans must show existing and proposed contours, drainage channels, and stormwater retention provisions.
What is included in a grading and drainage plan?
Plans must include property limits, accurate contours, terrain details, limiting dimensions, elevations, slopes, finish contours, drainage channels, and provisions for on-site retention per the Stormwater Policies and Standards Manual.
Tempe FAQ
Do I need a grading permit in Tempe?
Yes, for projects that alter the natural grade of land. Contact the Engineering department for permit requirements based on your project scope.
Can I change the drainage on my property?
Drainage modifications must not increase runoff to adjacent properties. A drainage plan may be required. Contact Engineering for guidance.
What is the Indian Bend Wash?
It is a major flood control channel running north-south through Tempe that also serves as a recreation greenbelt. Development near it must comply with flood management regulations.
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