Erosion Control: Altadena vs Santa Monica
How do erosion control rules compare between Altadena, CA and Santa Monica, CA?
Altadena and Santa Monica have similar restriction levels.
Altadena, CA
Los Angeles County
All grading and disturbed sites in Altadena must implement erosion controls under LA County Building Code Title 26 Appendix J and the County's MS4 permit. Rainy-season grading (Oct 15 – Apr 15) requires Best Management Practices approved by Public Works.
View full Altadena rules →Santa Monica, CA
Los Angeles County
Santa Monica requires erosion control measures during construction. Excavated soil must be positioned to prevent sediment runoff. Emergency plastic covering allowed for unprotected areas. Detention ponds and infiltration pits required as needed.
View full Santa Monica rules →Key Facts Comparison
| Fact | Altadena | Santa Monica |
|---|---|---|
| Code Section | LA County Title 26 App. J + CSD 22.306.060.B.3.b | - |
| Rainy Season | Oct 15 – Apr 15 | - |
| BMPs Required | Silt fences, fiber rolls, hydroseed | - |
| Soil Management | - | Prevent runoff to streets/neighbors |
| Emergency Cover | - | Plastic covering permitted |
| BMPs | - | Detention ponds, infiltration pits |
| Drainage Controls | - | Required based on topography |
Highlighted rows indicate differences between cities.
Altadena FAQ
Do I need erosion controls during winter construction in Altadena?
Yes — rainy-season grading (Oct 15 to Apr 15) must implement Public Works–approved BMPs per Altadena CSD 22.306.060.B.3.b.
Santa Monica FAQ
Do I need erosion control for a small project?
Most jurisdictions require erosion control for any ground disturbance over 500 to 1,000 square feet. Check Santa Monica grading permit requirements.
Who inspects erosion controls?
Santa Monica building or public works department inspects during active construction. Federal EPA NPDES permits may also apply for sites over one acre.
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