Grading & Drainage: Marana vs Oro Valley
How do grading & drainage rules compare between Marana, AZ and Oro Valley, AZ?
Marana and Oro Valley have similar restriction levels.
Marana, AZ
Pima County
Marana requires grading and drainage permits for land disturbance projects under the Land Development Code. The town works with the Pima County Regional Flood Control District to enforce floodplain management and drainage design standards, particularly critical in the Santa Cruz River watershed.
View full Marana rules →Oro Valley, AZ
Pima County
Oro Valley requires grading permits for disturbance exceeding 50 cubic yards. Drainage reports must show post-development runoff does not exceed pre-development levels.
View full Oro Valley rules →Key Facts Comparison
| Fact | Marana | Oro Valley |
|---|---|---|
| Permit Threshold | 50+ cubic yards or 3+ foot slopes | 50 cubic yards or 3-foot cuts/fills |
| Drainage Standard | Post-development must not exceed pre-development flows | - |
| Flood District | Pima County RFCD co-jurisdiction | - |
| Professional Required | Licensed civil engineer or landscape architect | - |
| Rainwater Harvesting | Encouraged under HB 2675 | - |
| Design Storm | - | 100-year, 2-hour event |
| Peak Runoff | - | Post-development cannot exceed pre-development |
| Stabilization Deadline | - | 14 days after grading completion |
| Hillside Grading | - | Pad grading only -- no mass grading |
Highlighted rows indicate differences between cities.
Marana FAQ
When do I need a grading permit in Marana?
A grading permit is required when moving more than 50 cubic yards of material, creating slopes over 3 feet in height, or altering natural drainage patterns. Plans must be prepared by a licensed Arizona civil engineer or landscape architect.
Can I harvest rainwater on my Marana property?
Yes. Arizona HB 2675 encourages residential rainwater harvesting, and Marana supports on-site retention. No permit is needed for basic rain barrel or cistern installation, but larger systems that modify drainage may require review under the grading permit process.
What if my property is in a flood zone?
Development in FEMA-designated flood zones requires additional review through the Pima County Regional Flood Control District, including elevation certificates and compliance with the floodplain management ordinance.
Oro Valley FAQ
Do I need a grading permit to level my yard in Oro Valley?
If the work exceeds 50 cubic yards or involves cuts or fills deeper than 3 feet, a grading permit is required. Even smaller projects that alter drainage patterns toward neighboring properties may trigger Town review.
Can I redirect drainage on my property?
You cannot concentrate or redirect stormwater onto adjacent properties. Any drainage alteration requires engineering review and potentially a grading permit to ensure no adverse impacts.
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