Sourced from OAR chapter 340 divisions 071 and 073 as amended effective January 1, 2026, ORS 105.464 (the statutory seller’s property disclosure statement), OAR 340-071-0120, and OSU Extension guidance on well testing at sale — last checked August 2026.
There is no point-of-sale inspection requirement
We checked this directly rather than assuming. A full-text search of divisions 071 and 073 in the January 1, 2026 edition for “time of transfer”, “point of sale”, “transfer of property”, “sale of property”, “real estate” and “conveyance” returns nothing. No such requirement exists anywhere in either division.
What you do have to do: answer the questions
Oregon’s seller’s property disclosure statement, at ORS 105.464, contains a section headed SEWAGE SYSTEM with fourteen questions. Among the ones that matter most for a septic property:
| The question asks | Why it bites |
|---|---|
| Was the system installed by permit? | An unpermitted system is a real problem for a buyer’s lender and for the buyer’s own future permit applications. Your certificate of satisfactory completion is the answer to this |
| Has the condition of the system been evaluated and a report issued? | You are not required to have done this. You are required to say whether you have — and if you have, the report exists and a buyer may ask for it |
| Are all components of the system located on the property? | Easy to answer wrongly. Drainfields cross boundaries more often than owners realize, and a component on a neighbor’s land is an easement question, not a septic question |
| Is a service contract for routine maintenance required for the system? | If you have a sand filter, pressurized distribution, recirculating gravel filter or advanced treatment unit, the answer may well be yes — and the buyer inherits it |
The disclosure is the enforcement mechanism. There is no inspector standing between you and closing, but there is a signed statement, and answering it carelessly is the risk.
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The contrast nobody points out: the well gets tested, the septic does not
And as OSU Extension notes about the well test, the state “doesn’t require that these tests pass, they just require that the results be reported.”
So the water gets sampled and the thing most likely to contaminate it does not. If you are buying, that asymmetry is an argument for commissioning your own septic evaluation — and a nitrate result on the well test is worth reading closely, because it is the one number in the transaction that can point at a failing system.
What a buyer takes on at closing
Under OAR 340-071-0120(2), each owner of the real property is jointly and severally responsible for treating the wastewater generated on it and for maintaining, repairing and replacing the system.
The obligation attaches to ownership of the land. Not to whoever installed the system, not to whoever last used it, and not to the seller who knew it was struggling. It transfers with the deed. If the system is failing on the day you buy, the duty to repair it immediately is yours from that day.
Sensible steps on each side
If you are selling: find your permit and certificate of satisfactory completion before you list. Find your maintenance contract if you have one. Know whether every component is on your land. Answering the disclosure from records rather than memory is the whole job.
If you are buying: nothing obliges the seller to have the system evaluated, so commission your own if the property matters to you. Ask which system type it is — if it is an advanced treatment unit or a recirculating gravel filter, a perpetual maintenance contract comes with it regardless of the system’s age. And read the disclosure answers as a list of things to verify, not as a survey.
Get a system evaluated before you commit
An evaluation before closing costs far less than a drainfield afterwards. We can connect you with licensed local professionals at no cost.
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Frequently Asked Questions
Does Oregon require a septic inspection when selling a house?
No. A full-text search of OAR divisions 071 and 073 for time of transfer, point of sale, transfer of property and real estate returns nothing. What Oregon requires instead is that the seller answer the statutory disclosure questions.
What must I disclose about septic when selling in Oregon?
ORS 105.464 contains a section headed SEWAGE SYSTEM with fourteen questions, including whether the system was installed by permit, whether its condition has been evaluated and a report issued, whether all components are located on the property, and whether a maintenance service contract is required.
Does Oregon test well water when a property is sold?
Yes — for bacteria and nitrate, with results reported to the state. The state does not require that the results pass, only that they be reported. There is no equivalent requirement for the septic system on the same property, which is why a nitrate result is worth reading closely.
Who is responsible for a septic system after a house is sold?
The buyer. OAR 340-071-0120(2) makes each owner of the real property jointly and severally responsible for maintaining, repairing and replacing the system. The duty attaches to owning the land, so it transfers with the deed.