Who pumps the tank, who pays for the septic inspection, and what happens if problems turn up, under Oregon's standard septic addendum.
When a home has a septic tank or other onsite sewage system, the sale has a few extra steps. In Oregon, pumping and inspection are worked out in the sale agreement, through a septic addendum that the buyer attaches to the standard Oregon sale agreement.
That addendum lets the buyer and seller decide which services happen and who pays for each one. The printed form does not pick a payer for you, so it is worth talking it through with your broker before you write or accept an offer. For the rest of the inspection process, see our home inspection checklist for Oregon buyers and what happens between offer accepted and closing.
Questions
Does the seller have to pump the septic tank before closing in Oregon?
Pumping is worked out in the sale agreement. When the home has a septic or other onsite sewage system, the standard Oregon sale agreement (OREF 001) has the buyer attach the Septic/Onsite Sewage System Addendum (OREF 081). In that addendum the parties check which services will happen (pumping or cleaning, locating or digging to reach the system, inspections or tests, or other services) and, for each one, check whether the seller or the buyer pays. The printed form does not pick a payer for you.
Who pays for the septic inspection?
Whichever party the septic addendum names for that service. The party paying for a service orders it within the number of business days written in the addendum (three if left blank), and inspections must be done by a DEQ-certified professional.
What septic records does the seller provide?
The seller provides the system records they have, such as recent inspections, maintenance contracts, permits and as-built drawings, within the number of business days written in the addendum (three if left blank).
What happens if the septic inspection finds problems?
If the reports show substantial deficiencies, the buyer sends the seller a list, and the two sides get a short window to negotiate who fixes what and who pays. If they cannot agree, the buyer can back out with a refund of deposits. If the buyer does not, the buyer is treated as accepting the system.
Can anyone order an evaluation of an existing septic system?
Yes. Oregon DEQ's rules let any person request an evaluation report on an existing system from a qualified evaluator.
Does the seller's disclosure statement cover the septic system?
Yes. Oregon's seller's property disclosure statement asks whether and when the septic tank has been pumped.
How often should a septic tank be inspected and pumped?
Oregon DEQ advises having the tank inspected on a regular basis, approximately every 5 to 7 years, and pumped by a DEQ-licensed pumper when solids build up past 40 percent. DEQ also advises hiring a qualified inspector to check the system before you buy a property with an existing septic system.
For local requirements, check with Deschutes County Environmental Soils. Have a question about your own sale? Talk with a Ryan Realty broker before you write or accept an offer, and we will walk you through it.
Sources
- OREF 001 Residential Real Estate Sale Agreement (Released 01/2026), Section 14 and Section 12.2
- OREF 081 Septic/Onsite Sewage System Addendum (Released 01/2026), Sections 1 to 7
- OAR 340-071-0155, existing system evaluation report: Oregon Administrative Rules
- Oregon DEQ, About onsite septic systems
- ORS 105.464, seller's property disclosure statement: Oregon Revised Statutes, chapter 105
Matt RyanOwner & Principal Broker at Ryan Realty.
