Multnomah County, OR septic permits and regulations
Septic systems in Multnomah County, Oregon are permitted by City of Portland Permitting & Development under OAR 340-071.
Septic permit program
- Program type: Mixed
- Authorized agent: Multnomah County Health Department
- Own septic program: No, uses Oregon state rules
- Local rules beyond the state: No
- Population: 815,428
Permit fee comparison
Average septic permit fee in Multnomah County: $621. Oregon average: $621.
Local rules
County operates under state-level OAR 340-071 (Onsite Sewage Disposal). Contact local health department for any additional county-specific requirements.
What SepticPro has on file for Multnomah County
- 49 permit fees with sources
- The agency phone, email and office address
- Setback distances
- Soil and perc test requirements
- Allowed system types
- System design rules
- Inspection requirements
- Maintenance and pumping rules
- Point-of-sale rules
- Installer, designer and pumper licensing
Create a free account to see the full details.
Draw a permit-ready site plan for Multnomah County
Enter the address, draw the system on the aerial with the parcel lines and topo, and print it to scale for City of Portland Permitting & Development. See how SepticPro site plans work.
Other Oregon counties
- Baker County
- Benton County
- Clackamas County
- Clatsop County
- Columbia County
- Coos County
- Crook County
- Curry County
- Deschutes County
- Douglas County
- Gilliam County
- Grant County
- Harney County
- Hood River County
- Jackson County
- Jefferson County
- Josephine County
- Klamath County
- Lake County
- Lane County
- Lincoln County
- Linn County
- Malheur County
- Marion County
Data checked 2026-03-16. Always confirm requirements with City of Portland Permitting & Development before applying.