Grading & Drainage: Mesa vs Phoenix
How do grading & drainage rules compare between Mesa, AZ and Phoenix, AZ?
Mesa and Phoenix have similar restriction levels.
Mesa, AZ
Maricopa County
Mesa requires grading permits for land disturbance activities under its Engineering Standards and the adopted International Building Code. All development must manage drainage so that post-development runoff does not exceed pre-development levels and stormwater is directed to approved drainage facilities. Mesa's relatively flat terrain and alluvial soils require careful attention to sheet flow and retention basin design.
View full Mesa rules →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 →Key Facts Comparison
| Fact | Mesa | Phoenix |
|---|---|---|
| Permit Required | Grading permit for land disturbance | - |
| Drainage Standard | Post-development runoff must not exceed pre-development | - |
| Retention | On-site retention required for 100-year, 2-hour storm | On-site stormwater retention required |
| Review Authority | Mesa Development Services Engineering | - |
| Terrain | Generally flat with alluvial desert soils | - |
| Code Chapter | - | Phoenix City Code Chapter 32A |
| Permit Section | - | §32A-9 |
| SWPPP | - | Required per state/federal regulations |
| Design Standards | - | Chapter 6, Stormwater Policies Manual |
Highlighted rows indicate differences between cities.
Mesa FAQ
Do I need a grading permit in Mesa?
Yes, most land-disturbing activities require a grading permit from Mesa Development Services. This includes site clearing, excavation, filling, and any work that alters the natural drainage pattern of a property.
What are Mesa's stormwater retention requirements?
Development projects must retain stormwater on-site for the 100-year, 2-hour storm event. Retention basins, underground chambers, or other approved facilities must be designed and maintained to prevent flooding of adjacent properties.
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.
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