Grading & Drainage: Simi Valley vs Ventura
How do grading & drainage rules compare between Simi Valley, CA and Ventura, CA?
Simi Valley and Ventura have similar restriction levels.
Simi Valley, CA
Ventura County
Simi Valley requires grading permits for significant earth-moving activities and enforces drainage standards to prevent erosion, sedimentation, and impacts on neighboring properties. Hillside grading is subject to enhanced review.
View full Simi Valley rules →Ventura, CA
Ventura County
Ventura requires grading permits for significant earth-moving activities. Drainage plans must demonstrate that water flows are managed and do not adversely impact neighboring properties. Hillside grading is subject to enhanced standards including geotechnical review.
View full Ventura rules →Key Facts Comparison
| Fact | Simi Valley | Ventura |
|---|---|---|
| Permit Trigger | Over 50 cubic yards cut/fill | - |
| Hillside Grading | Geotechnical report required | - |
| Erosion Control | Required October through April | - |
| Drainage | May not impact neighboring properties | - |
| Permit | - | Required for significant grading |
| Drainage Plan | - | Must show no adverse impact to neighbors |
| Hillside | - | Geotechnical report required |
| Coastal Zone | - | CDP may be required |
| Contact | - | Community Development (805) 654-7869 |
Highlighted rows indicate differences between cities.
Simi Valley FAQ
Do I need a grading permit in Simi Valley?
Yes, for earth-moving exceeding 50 cubic yards. Projects on steep slopes or in hillside areas require geotechnical reports and enhanced review by the Building Division.
Can I change the drainage on my property?
Grading may not direct water onto neighboring properties. A drainage study may be required for projects that significantly alter surface water flow patterns.
When are erosion controls required?
Temporary erosion control measures must be in place during the rainy season (October through April) and throughout active construction regardless of season.
Ventura FAQ
Do I need a grading permit in Ventura?
Significant earth-moving activities including cuts, fills, and grade changes exceeding certain thresholds require grading permits. Contact Community Development at (805) 654-7869 for specific thresholds.
Can I change the drainage on my property?
Changes must not adversely impact neighboring properties. A drainage plan may be required showing how water flows are managed. Redirecting water onto a neighbor's property creates liability.
What about grading on hillside lots?
Hillside grading requires geotechnical reports, enhanced slope stability analysis, and erosion control measures in addition to standard grading permits.
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