Grading & Drainage: Fillmore vs Simi Valley
How do grading & drainage rules compare between Fillmore, CA and Simi Valley, CA?
Fillmore and Simi Valley have similar restriction levels.
Fillmore, CA
Ventura County
Fillmore requires grading permits for earthwork that alters the natural grade of land. Projects must include drainage plans to prevent water from flowing onto neighboring properties. The city's Santa Clara River floodplain location makes drainage management essential.
View full Fillmore rules →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 →Key Facts Comparison
| Fact | Fillmore | Simi Valley |
|---|---|---|
| Permit Threshold | Typically 50+ cubic yards | - |
| Engineer Required | Licensed civil engineer | - |
| LID Required | Per MS4 Permit | - |
| Drainage Rule | Cannot increase runoff to neighbors | - |
| Contact | (805) 524-1500 ext 234 | - |
| 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 |
Highlighted rows indicate differences between cities.
Fillmore FAQ
Do I need a grading permit in Fillmore?
Yes, for earthwork exceeding specified thresholds (typically 50 cubic yards). A licensed civil engineer must prepare grading and drainage plans. Contact Community Development at (805) 524-1500 ext 234.
Can I change the drainage on my property in Fillmore?
You cannot divert stormwater onto neighboring properties. Grading and drainage changes require a permit with engineered plans showing how water will be managed without impacting neighbors.
Why is drainage so important in Fillmore?
Fillmore sits in the Santa Clara River floodplain with high groundwater in many areas. Improper drainage can cause flooding, foundation damage, and river pollution. Engineered drainage plans are essential.
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.
Compare other topics
See how Fillmore and Simi Valley compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool