Stormwater Discharges from Construction Activities in Region 10
In Region 10, EPA is the NPDES permitting authority for facilities on Indian Country lands in Idaho, Oregon and Washington; federal operators in Washington; and the Metlakatla Reservation and Denali National Park in Alaska.
Do I Need a Permit?
Use this chart to help you decide whether you need to apply for coverage under the under the Construction General Permit (CGP): Construction General Permit Flow Chart
How to Apply
- Read EPA's 2022 Construction General Permit.
- Develop a Stormwater Pollution Prevention Plan (SWPPP) for your construction site.
- Complete an endangered species determination for the project site (details are noted in the CGP).
- Get authorization from EPA if you plan to use chemical treatment (most projects do not - see below for more information).
- File a Notice Of Intent (NOI) using EPA's NPDES eReporting Tool (CGP-Net).
- Implement the Best Management Practices (BMPs) outlined in the SWPPP.
Special Instructions for Chemical Treatment
If you plan to use cationic chemicals, you will need to get prior authorization from EPA's Regional Office. The following documents will help you compile the information we need to review your cationic chemical application.
- CGP Appendix J: Suggested Format for Request for Chemical Treatment (pdf)
- Example Map of Chemical Treatment at Construction Sites (pdf)
Forms and Templates
- 2012 CGP and Related Documents
- Stormwater Pollution Prevention Plan (SWPPP) Templates
- Stormwater Discharges from Construction Activities
- Poster: Stormwater and the Construction Industry (pdf)- 30" x 40" poster that illustrates proper installation of common sediment and erosion control practices (best management practices).
- Construction Industry Compliance Assistance- EPA-sponsored website with environmental compliance assistance information for contractors, builders/developers. Includes relevant material and links to state and local permitting authorities.
- Alaska Stormwater Program (Alaska Dept. of Environmental Conservation)
- Alaska Construction General Permit
- Alaska Stormwater Guide
The EPA CGP only applies to projects on tribal lands within Idaho. All other projects are within the State of Idaho’s permit program. To apply for storm water permits, go to Idaho DEQ’s E-Permitting system.
For assistance, please contact the IPDES E-Permitting Support at (833) 473-3724 or IPDESE-Permitting@deq.idaho.gov.
- Idaho Stormwater (Idaho Dept. of Environmental Quality)
- Idaho Catalog of Storm Water Best Management Practices (pdf)
The EPA CGP only applies to projects on tribal lands within Oregon. All other projects are within the State of Oregon’s permit program.
Projects operated by federal agencies or on tribal lands in Washington must apply for coverage under EPA’s Construction General Permit.
Projects operated by state or private entities must apply for coverage under Washington’s Construction Stormwater General Permit (including projects on federal lands).