Stormwater Discharges from Construction Activities in Region 10
In Region 10, EPA is the NPDES permitting authority for facilities in Idaho; facilities on Indian Country lands in 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 2017 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 L: Suggested Format for Request for Chemical Treatment (PDF)(4 pp, 201 K)
- Example Map of Chemical Treatment at Construction Sites (PDF)(1 pp, 18 K)
Forms and Templates
- 2017 CGP and Related Documents
- Stormwater Pollution Prevention Plan (SWPPP) Templates
- Stormwater Discharges from Construction Activities
- Sample Stormwater Construction Site Inspection Report (Word File)(4 pp, 115 K) - This form is often used by the EPA when conducting construction site inspections. This checklist is a useful tool but not comprehensive. It should not be used as a stand-in for the actual permit requirements.
- Poster: Stormwater and the Construction Industry (PDF)(2 pg, 743 K) - 30" x 40" poster that illustrates proper installation of common sediment and erosion control practices (best management practices).
- Construction Industry Compliance Assistance Exit- 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)Exit
- Alaska Construction General PermitExit
- Alaska Stormwater GuideExit
Construction projects in Idaho must apply for coverage under EPA’s Construction General Permit. Note that Idaho has added state-specific provisions to the permit. Please be sure to read section 9.7.1 of the permit.
- Stormwater in Idaho (Idaho Dept. of Environmental Quality)Exit
- Idaho FAQ: Turbidity Monitoring Requirements (PDF)(2 pp, 28y K)Exit
- Idaho Catalog of Storm Water Best Management Practices (PDF)(582 pp, 34 MB)
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 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 PermitExit(including projects on federal lands).
- Washington Stormwater General Permits (Washington Dept. of Ecology)Exit
- Washington Stormwater ManualsExit