Sourced from OAR 340-071-0100 definitions, OAR 340-071-0215 and OAR 340-071-0120 as amended effective January 1, 2026, Oregon DEQ’s guidance on the January 1, 2026 rule package, and published county fee schedules — last checked August 2026.
The classification that catches everyone out
Oregon splits repairs into two classes, and the split is not by cost or by difficulty. It is by which part of the system you are touching.
| Class | What it covers |
|---|---|
| Major repair | Replacing the soil absorption facility (the drainfield), the treatment unit, or any part of either |
| Minor repair | Replacing a septic tank, a broken pipe, a distribution unit, or any part of the system external to the septic tank or treatment facility — except the soil absorption system |
The logic is environmental rather than financial: the soil absorption facility is where treatment actually happens and where a failure reaches groundwater. It matters because the class determines the permit and the fee — so if a contractor tells you a drainfield replacement is “just a minor repair,” that is worth questioning.
You need the permit before the work, not after
OAR 340-071-0215(2) is explicit: except for emergency repairs, “a person may not repair a failing system without first obtaining a repair permit.”
For emergencies, work may begin first — provided a repair permit application reaches the agent within three working days after the emergency repairs are begun. The clock starts when the work starts, not when the problem started, and it counts working days.
Settle who is filing that application before anyone digs. It is a common assumption on both sides that the other party is handling it.
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“Immediately” — and the weather exception
OAR 340-071-0215(1) requires the owner to ensure a failing system is immediately repaired, unless in the agent’s opinion adverse soil conditions caused by the weather would likely prevent a successful repair. In that case the agent may allow a delay — and if they do, they must issue a notice of noncompliance setting a compliance date and any interim provisions.
This is a sensible rule for a wet state, and it is one of the few weather clauses of its kind anywhere. But it is the agent’s call. Deciding on your own to wait out the winter is not the same thing, and leaves you non-compliant with no notice, no date and no record.
Some work no longer needs a permit — depending on who does it
The January 1, 2026 amendments changed what counts as major maintenance: repairing or replacing a broken distribution box or drop box, or a broken or plugged effluent sewer pipe.
Identical task, identical component, identical result. The permit requirement turns on who is holding the shovel. It is the clearest example in the Oregon rules of a duty attaching to the person rather than the work.
What a repair permit costs
Repair permit fees are set county by county under OAR 340-071-0140(9)(a), like everything else, and the statewide DEQ surcharge of $159 applies on top for applications on or after July 1, 2026.
We are deliberately not printing a repair-fee table. The one large county schedule we retrieved in full parsed inconsistently on the repair rows — one read returned a minor repair costing more than a major repair, which cannot be right — and we would rather send you to your agent than publish a number we do not trust. The fees we can stand behind are here, along with the counties whose schedules we could not obtain at all.
Whose problem it is
Under OAR 340-071-0120(2) each owner of the real property is jointly and severally responsible for maintaining, repairing and replacing the system. The duty runs with ownership of the land — not with whoever installed the system, and not with whoever broke it. Buying the property buys the obligation.
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Frequently Asked Questions
Is replacing a septic tank a major or minor repair in Oregon?
A minor repair. Replacing the drainfield is the major repair. The classification is by which part of the system you are touching, not by cost — the soil absorption facility is where treatment happens and where a failure reaches groundwater.
Do I need a permit before repairing my septic system?
Yes. OAR 340-071-0215(2) says a person may not repair a failing system without first obtaining a repair permit — except for emergency repairs, where work may begin first provided an application reaches the agent within three working days after the repairs are begun.
How long do I have to file after an emergency septic repair?
Three working days from when the emergency repairs are begun, not from when the problem started. Settle who is filing the application — you or the contractor — before anyone digs.
Can I do septic repair work myself in Oregon?
Some maintenance work is permit-exempt only when a certified maintenance provider or certified installer performs it. Repairing or replacing a broken distribution box, drop box or effluent sewer pipe still requires a permit if the property owner does it themselves.