Septic Resources

The purpose of On-site Septic System (OSS) Program is to ensure proper treatment and disposal of wastewater to protect our environment and drinking water. We issue septic permits, inspect final septic installations, and investigate complaints associated with On-site Sewage systems.

Septic System Failure

For information on failing septic systems, please see our Septic Failure Brochure.

• Setbacks
• Site Plan Checklist
• Waiver Request
• Sample Shared Well (Joint Use) Agreement
• Covenant Examples (100’ radius)
• Group A or B Water Systems Handout 
• Group B Public Water Systems Handout 
• Group B Water System Guidance 
• On-site Sewage Systems Chapter 246-272A WAC
• EPA Website
• Chelan County Community Development
• Douglas County Land Services
• Eviction Help
  

Effective April 1, 2025

All provisions of the rule excluding changes to WAC 246-272A-0110, the Maintenance Service Provider approval requirement, and Property Transfer Inspection requirement. Click here to learn more.

WAC 246-272A Code Revision

Resources

‍SepticSmart Quick Tip videos

SepticSmart Long Homeowner Guide (Spanish version here)

SepticSmart Top 10 Ways to be a Good Septic Owner (Spanish version here)

SepticSmart Infographic (Spanish version here)

SepticSmart Do’s and Don’ts of Your Septic System (Spanish version here)

Septic Tank Lid Safety

Governor's SepticSmart Week Proclamation 2025