Grading & Drainage: Green Valley vs Oro Valley
How do grading & drainage rules compare between Green Valley, AZ and Oro Valley, AZ?
Green Valley and Oro Valley have similar restriction levels.
Green Valley, AZ
Pima County
Pima County requires grading permits for land disturbance in unincorporated areas and enforces strict drainage standards through the Regional Flood Control District. All new construction must demonstrate that post-development drainage does not increase runoff to adjacent properties. Washes and arroyos have mandatory setback buffers.
View full Green Valley 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 | Green Valley | Oro Valley |
|---|---|---|
| Permit Authority | Development Services | - |
| Drainage Review | RFCD Drainage Design Manual | - |
| Wash Setbacks | 25-100 ft by classification | - |
| Steep Slope Trigger | 15 percent grade | - |
| Retention | First inch on-site | - |
| Permit Threshold | - | 50 cubic yards or 3-foot cuts/fills |
| 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.
Green Valley FAQ
Do I need a grading permit in unincorporated Pima County?
Yes. Any significant land disturbance requires a grading permit from Pima County Development Services. Projects near washes or in floodplains also need RFCD drainage review and possibly a floodplain use permit.
What are the wash setback requirements in Pima County?
Setbacks from washes range from 25 to 100 feet depending on the wash classification. Building within these setbacks requires a floodplain use permit and may be prohibited entirely in critical erosion hazard zones.
Can I redirect drainage on my property in Pima County?
You may not redirect drainage in a way that increases runoff to neighboring properties. Post-development drainage must match or improve predevelopment patterns, and the first inch of rainfall must be retained on-site.
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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