Onsite Sewage Disposal Program  

What Type of Application Do You Need?

(If your system is over 2,500 gallons per day, please reach out to Oregon DEQ for permitting requirements: DEQ Water Pollution Control Facilities) 

Please read through the following options below and select the appropriate packet:

1. Is the septic system failing? Is sewage surfacing on the ground or backing up into the house? 

(NOTE: A failing septic system must be immediately repaired to eliminate the public health hazard per OAR 340-071-0215.)

• If repairing or replacing the septic tank, effluent line, or distribution box(es)  — Apply for a Septic MINOR REPAIR. 
  
• If repairing or replacing the drain field, or any alternate treatment technology with or without new septic tank— Apply for a Septic MAJOR REPAIR .
  

2. Are you trying to connect into an existing septic system due to replacing a home, adding a hardship home, adding bedrooms to an existing building, or changing the use/occupancy of an existing building?   

• If re-connecting to an existing system with no increase in flow – Apply for a Septic Authorization. 
• If re-connecting to an existing system with an increase of flow up to 50% of the existing system capacity or 300-GPD, whichever is less – Apply for a Septic Authorization. 
  

3. Do you need to move the tank and/or drain field to accommodate new construction or a building addition without bedrooms? (See point 2 for work that proposes additional bedrooms) 

• If moving the septic tank, effluent line, or distribution box(es), but leaving the existing septic drain field as-is – Apply for a Septic MINOR ALTERATION
  
• If moving or expanding the existing septic drain field and/or the tank, effluent line(s), & distribution box(es) – Apply for a Septic MAJOR ALTERATION 
• If installing a new system that is beyond 50% of the existing system capacity or 300-GPD – Apply for a Septic SITE EVALUATION, and after receiving an Approved Site Evaluation, apply for a CONSTRUCTION INSTALLATION.
  

4. Are you building an accessory structure without plumbing, or an exterior addition without bedrooms? 

• If there will be no plumbing and/or no addition of bedrooms - A Septic System Certification for Record Review form will need to be filled out and submitted with the structural application. 
  
• If plumbing is proposed in the accessory structure and gravity flow to the existing septic tank is attainable - A Septic permit is not required. Check for plumbing permit requirements. 
  
• If plumbing is proposed in the accessory structure and gravity flow to the existing septic tank is not attainable – Apply for a Septic MINOR ALTERATION to install a new septic tank with effluent pump to pump to the existing septic drain field. If an ejector pump is proposed to pump to the septic tank, the tank must be a two-compartment tank with an effluent filter. 
  

5. Are you partitioning your property? 

• For the existing parcel – Apply for a Septic Existing Systems Evaltuation. for the existing parcel, and 
  
• For the newly proposed parcels – Apply for Septic SITE EVALUATION(S).
  

6. Are you adjusting a lot line between properties? 

• To ensure that there is no conflict with the existing septic systems and replacement areas on the affected properties – Contact Public Works to ask for what is required.
  

7. Do you want to determine what type of septic system is required for an undeveloped parcel or when replacing an existing septic system? 

• Apply for a Septic SITE EVALUATION.
  

8. Do you want to install a septic system on your property and already have a valid Site Evaluation approval for the property? 

• Apply for a Septic CONSTRUCTION INSTALLATION.  (may require detailed construction plans depending on the type of septic system approved from the Site Evaluation.)
  

Application Packets 

General Applications & Forms