Erosion Control: Simi Valley vs Ventura
How do erosion control rules compare between Simi Valley, CA and Ventura, CA?
Simi Valley and Ventura have similar restriction levels.
Simi Valley, CA
Ventura County
Construction projects in unincorporated Ventura County must implement erosion control BMPs. Projects disturbing 1 acre or more require a SWPPP under the state Construction General Permit. Heightened requirements apply during the rainy season.
View full Simi Valley rules →Ventura, CA
Ventura County
Ventura requires erosion and sediment control measures during construction per the California NPDES Construction General Permit. Projects disturbing 1 acre or more require a Stormwater Pollution Prevention Plan (SWPPP). Hillside development faces enhanced erosion control standards.
View full Ventura rules →Key Facts Comparison
| Fact | Simi Valley | Ventura |
|---|---|---|
| BMPs Required | All soil-disturbing projects | - |
| SWPPP | Required for ≥1 acre | Required for projects 1+ acre disturbance |
| Rainy Season | Oct 1 - Apr 15 (heightened) | Enhanced controls October-April |
| Enforcement | Watershed Protection District | Stop-work orders + up to $10,000/day fines |
| State Permit | Construction General Permit | - |
| BMPs | - | Silt fences, fiber rolls, stabilization required |
| Permit | - | NPDES Construction General Permit |
Highlighted rows indicate differences between cities.
Simi Valley FAQ
What erosion controls are required?
Silt fences, fiber rolls, stabilized entrances, and erosion blankets. Projects over 1 acre need a SWPPP. Requirements increase during rainy season (Oct 1-Apr 15).
Do I need a grading permit?
Contact Building & Safety at (805) 654-2797. Grading permits include erosion control requirements.
What if sediment runs off my site?
Sediment discharge can result in fines from the county and the Regional Water Quality Control Board (up to $10,000/day). Implement BMPs before any grading.
Ventura FAQ
Do I need erosion control for my construction project?
Yes. All construction projects must implement minimum erosion and sediment control BMPs. Projects disturbing 1+ acre require a SWPPP and NPDES permit.
What are common erosion control measures?
Silt fences, fiber rolls, stabilized construction entrances, proper material storage, hydroseeding of disturbed areas, and sediment basins for larger projects.
When are erosion controls most important?
The rainy season from October through April requires enhanced erosion controls. All disturbed soil must be stabilized before the rainy season begins.
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