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New septic design and installation
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A site application design and installation permit are required when a new septic system* is constructed. Construction must not begin until the installation permit is posted on the site/property.
*A septic system is also referred to as an "on-site sewage system" in official documents, forms and applications.
King County Site Development Process Flow Chart:
- Include qualified professional engineer to flow chart
- Highlight Designer and Master Installer as link to list
Winter Water Table Review:
If conditions on the property indicate a high seasonal water table, a winter water table review may be required. Consult with your septic system professional regarding this matter.
Questions to ask your septic system designer & installer:
As with any person you may hire, you should interview at least 2-3 people. These are some helpful questions to ask when choosing your designer and/or installer. Click here for lists of septic professionals.
Ask your designer or qualified professional engineer:
- What is the price of the following? (some of these services are included in one fee):
- Preliminary site evaluation
- Soil log digging
- Design
- Stub-out inspection
- Pressure test
- Installation inspection
- Backfill inspection
- As-built package
- Do you charge extra for the Homeowner's manual?
- Do you charge for extra visits or consultations?
Ask your master installer:
- What is the price of the following?
- Preliminary evaluation
- Soil log digging
- Design for repairs
- Installation
- Does the bid include the County fees?
- Do you charge extra for backfill labor?
- Is the cost for the backfill material included?
- Is the timer (if required) included in the bid?
- Do you guarantee your work? Will you complete repairs if there is a problem?
Appealing Health Inspector Decision/Order:
If you would like to appeal Public Health - Seattle & King County's decision/order, click here for appeal instructions.
Forms used by your septic system professional:
Fees:
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