NOTE: Septic system is also referred to as "on-site sewage system" in official documents, forms and applications.

• King County Board of Health Codes
  • See Title 12 - Public Water Systems Rules & Regulations
    
  • See Title 13 - On-site Sewage Code
    
    
• Washington Board of Health Codes & Publications / Washington Administrative Code (WAC)
  • See Chapter 246-272 - On-site Sewage Systems
  • See Chapter 246-273 - On-site Sewage System Additives
    
    
• Wastewater Management: Publications (State Dept. of Health):
  Includes information regarding:
  • Recommended Standards and Guidance (RS&G's) for Performance, Application, Design, and Operation and Maintenance (Alternative On-Site Wastewater Systems)
  • List of Approved Systems and Products
  • Link to Rule Development Committee homepage