Grading & Drainage: Green Valley vs Tucson
How do grading & drainage rules compare between Green Valley, AZ and Tucson, AZ?
Tucson has fewer restrictions than Green Valley.
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 →Tucson, AZ
Pima County
Tucson requires grading permits for earthwork that alters natural drainage patterns under the Unified Development Code. The city mandates that post-development drainage must not adversely impact adjacent properties. Development must accommodate the unique desert drainage patterns including sheet flow and wash channels that activate during monsoon storms.
View full Tucson rules →Key Facts Comparison
| Fact | Green Valley | Tucson |
|---|---|---|
| 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 Required | - | Grading permit for significant earthwork |
| Drainage Report | - | Required for most development |
| Standard | - | No increase in runoff to adjacent properties |
| Wash Protection | - | Natural washes must be preserved |
| Engineer Required | - | Licensed engineer for drainage reports |
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.
Tucson FAQ
Do I need a grading permit in Tucson?
Yes, a grading permit is required for cuts or fills that exceed specified thresholds or that alter natural drainage patterns. Contact Planning and Development Services (PDSD) to determine if your project requires a permit.
Can I redirect water flow on my property?
You cannot redirect drainage in a way that increases runoff onto adjacent properties. A drainage report by a licensed engineer may be required to demonstrate compliance with the city's no-adverse-impact standard.
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