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All development projects in unincorporated Clackamas County (outside cities and special districts) must use erosion prevention and sediment control (EPSC) measures when soil is disturbed.
Some projects also require a separate erosion control permit, depending on the disturbance's size and location. See below to see if your project requires a permit.
Note: Erosion control permitting in Clackamas County is handled by different districts, including WES. Before applying, visit Erosion Control Permits in Clackamas County to confirm which district applies to your site.
Do I Need an Erosion Control Permit?
Many smaller projects do not require separate permits, but all projects must install and maintain erosion control measures when soil is disturbed.
| Soil Disturbance | Permit Required |
|---|---|
| Less than ½ acre | No separate permit required. EPSC measures must still be installed and maintained. |
| ½ to 1 acre | DTD Building Division EPSC permit |
| 1 acre or more | Oregon DEQ 1200-C permit |
| 500 sq. ft. or more within 50 feet of state surface waters | DTD Building Division EPSC |
Applying for a DTD EPSC Permit
Apply through Development Direct or visit the How to Apply for Permits page to submit your application and erosion control plans.
DTD EPSC permits generally apply to:
- Residential construction
- Small commercial additions and improvements
- Industrial additions and improvements
Note: An EPSC plan is required for all projects involving ground disturbance, even when a separate EPSC permit is not required.
Erosion Control Inspections
Most projects require an initial erosion control inspection.
- Single-family homes and additions
Inspection must be approved before or at the footing/foundation inspection. - Commercial, industrial, and multi-family projects
Inspection must be approved before any soil disturbance, except for installing erosion control measures.
A final inspection is required after the site has been permanently stabilized.
- Call 503-742-4720 to schedule your inspection
- Schedule online or through the Inspection Request app. You will need the appropriate Inspection Codes.
EPSC Planning and Design Manual
The Erosion Prevention and Sediment Control (EPSC) Planning and Design Manual provides approved methods, materials, and maintenance standards for construction sites.
Training
Training on erosion control installation and maintenance is available from private providers. Clackamas County does not approve or endorse specific training companies.
