King County, WA septic permits and regulations
Septic systems in King County, Washington are permitted by Public Health - Seattle & King County under WAC 246-272A.
Septic permit program
- Program type: County Health Department
- Authorized agent: King County Health Department
- Own septic program: No, uses Washington state rules
- Local rules beyond the state: No
- Population: 2,269,675
Permit fee comparison
Average septic permit fee in King County: $126. Washington average: $566.
Local rules
County operates under state-level WAC 246-272A (On-Site Sewage Systems). Contact local health department for any additional county-specific requirements.
What SepticPro has on file for King County
- 1 permit fee 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 King County
Enter the address, draw the system on the aerial with the parcel lines and topo, and print it to scale for Public Health - Seattle & King County. See how SepticPro site plans work.
Other Washington counties
- Adams County
- Asotin County
- Benton County
- Chelan County
- Clallam County
- Clark County
- Columbia County
- Cowlitz County
- Douglas County
- Ferry County
- Franklin County
- Garfield County
- Grant County
- Grays Harbor County
- Island County
- Jefferson County
- Kitsap County
- Kittitas County
- Klickitat County
- Lewis County
- Lincoln County
- Mason County
- Okanogan County
- Pacific County
Data checked 2026-05-15. Always confirm requirements with Public Health - Seattle & King County before applying.