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. Should I use an additive in my septic tank?
2. When is an OSS permit needed?
3. Can I design my own OSS?
4. Can I install my own OSS after I obtain an OSS permit?
5. Do you have a copy of my OSS permit?
6. How do I clean up sewage that has backed up into my house?
7. What are some signs that my OSS is failing?
8. How can I find my septic tank?
9. What is the reserve area?