Erosion Control: Downey vs Los Angeles
How do erosion control rules compare between Downey, CA and Los Angeles, CA?
Downey and Los Angeles have similar restriction levels.
Downey, CA
Los Angeles County
Grading and construction projects in Downey exceeding 1 acre require a Stormwater Pollution Prevention Plan (SWPPP). Erosion control measures must be in place during the rainy season per state and county requirements.
View full Downey rules →Los Angeles, CA
Los Angeles County
An Erosion and Sediment Control Plan (ESCP) is required for construction projects in LA. Projects disturbing 1+ acres must file a state SWPPP with the Regional Water Quality Control Board. The LID ordinance requires BMPs to prevent erosion during and after construction. Hillside grading is subject to additional erosion controls under LAMC Chapter IX.
View full Los Angeles rules →Key Facts Comparison
| Fact | Downey | Los Angeles |
|---|---|---|
| SWPPP | Required for sites >1 acre | - |
| Rainy Season | Oct 1 - Apr 15 BMPs required | - |
| County | LA County grading requirements | - |
| State | CA Construction General Permit | - |
| ESCP | - | Required for construction projects |
| 1+ Acre | - | State SWPPP required |
| Hillside | - | Additional grading controls |
| BMP Handbook | - | City Development BMP standards apply |
Highlighted rows indicate differences between cities.
Downey 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 Downey grading permit requirements.
Who inspects erosion controls?
Downey building or public works department inspects during active construction. Federal EPA NPDES permits may also apply for sites over one acre.
Los Angeles 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 Los Angeles grading permit requirements.
Who inspects erosion controls?
Los Angeles building or public works department inspects during active construction. Federal EPA NPDES permits may also apply for sites over one acre.
Compare other topics
See how Downey and Los Angeles 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