Stormwater Management: Green Valley vs Sahuarita
How do stormwater management rules compare between Green Valley, AZ and Sahuarita, AZ?
Sahuarita has fewer restrictions than Green Valley.
Green Valley, AZ
Pima County
Pima County enforces stormwater management through the Pima County Regional Flood Control District (RFCD) and the county MS4 permit under the Clean Water Act. The Sonoran Desert monsoon season (July-September) drives strict drainage and retention requirements. All new development must retain the first inch of stormwater on-site per county standards.
View full Green Valley rules →Sahuarita, AZ
Pima County
Sahuarita requires stormwater management for new development to prevent flooding, erosion, and water quality degradation. The monsoon season brings intense rainfall that demands effective drainage infrastructure and on-site retention.
View full Sahuarita rules →Key Facts Comparison
| Fact | Green Valley | Sahuarita |
|---|---|---|
| Authority | Regional Flood Control District | - |
| Retention Standard | First 1 inch on-site | - |
| Permit Trigger | 1 acre or more disturbance | - |
| Monsoon Season | July through September | - |
| Contact | RFCD 520-724-4600 | - |
| Monsoon Intensity | - | 1-3 inches per hour possible |
| Retention | - | On-site stormwater retention required |
| Flood Control | - | Pima County RFCD has jurisdiction |
| Grading | - | Must direct water away from structures |
| Low-Impact Design | - | Pervious paving and bioswales encouraged |
Highlighted rows indicate differences between cities.
Green Valley FAQ
What stormwater retention is required in Pima County?
New developments must retain the first inch of stormwater on-site. This is based on the 100-year, 2-hour storm standard. Retention basins, bioswales, and permeable surfaces are common compliance methods.
Do I need a stormwater permit for construction in Pima County?
Yes, if your project disturbs one acre or more. You must file an AZPDES Notice of Intent with ADEQ and implement a Stormwater Pollution Prevention Plan (SWPPP) before breaking ground.
Who manages stormwater in unincorporated Pima County?
The Pima County Regional Flood Control District (RFCD) manages stormwater infrastructure, floodplain regulations, and drainage standards. Contact them at 520-724-4600.
Sahuarita FAQ
Do I need a drainage plan for my home improvement project?
Any project that changes the grading of your lot, adds impervious surfaces, or modifies drainage patterns should include a drainage plan. Significant projects may require review by Sahuarita Building Safety.
Can I direct my downspouts onto my neighbor property?
No. You may not modify your property grading or drainage in ways that redirect stormwater onto neighboring properties. Drainage must be managed on-site or directed to approved drainage facilities.
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