Can I design my own OSS?
State and county sewage control regulations require that either a licensed OSS designer or Registered Professional Engineer design your OSS. The state issues Licenses for Designers and Engineers.Washington State Department of Licensing

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1. Can I use my septic system during or after a flood?
2. How do I know if my septic system was damaged by flooding, and how can I get it fixed?
3. Should I use an additive in my septic tank?
4. When is an OSS permit needed?
5. Can I design my own OSS?
6. Can I install my own OSS after I obtain an OSS permit?
7. Do you have a copy of my OSS permit?
8. How do I clean up sewage that has backed up into my house?
9. What are some signs that my OSS is failing?
10. How can I find my septic tank?
11. What is the reserve area?