Erosion Control: Altadena vs Pomona
How do erosion control rules compare between Altadena, CA and Pomona, CA?
Altadena and Pomona 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 →Pomona, CA
Los Angeles County
Pomona requires erosion control plans for grading and construction projects. BMPs must be implemented during rainy season. Projects must comply with the LA County NPDES permit requirements.
View full Pomona rules →Key Facts Comparison
| Fact | Altadena | Pomona |
|---|---|---|
| Code Section | LA County Title 26 App. J + CSD 22.306.060.B.3.b | - |
| Rainy Season | Oct 15 – Apr 15 | Oct 1 - Apr 15 enhanced BMPs |
| BMPs Required | Silt fences, fiber rolls, hydroseed | - |
| Plans Required | - | For grading and construction |
| NPDES | - | LA County permit compliance |
| Code | - | Pomona grading regulations |
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.
Pomona 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 Pomona grading permit requirements.
Who inspects erosion controls?
Pomona 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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