If a house is on a septic system, two things are worth doing before you are too far in: get the system inspected, and pull its permit record. The inspection tells you what the system is doing now. The permit record tells you what it was built to do, and whether anyone signed off on it in the first place. Those are different questions, and a house can pass one and fail the other.
Where Lane County's Septic Records Live
Start in the right building. People often go looking at the state first, because septic is an environmental matter and DEQ is the agency that comes to mind. For Lane County that is the wrong door.
DEQ keeps onsite records online for Curry, Jackson and Josephine counties, along with records created before June 1, 2025 for Baker, Union and Wallowa. For every other county — Lane included — it points you at the local agent.
Here, that is Lane County's Land Management Division. Its Property Records Online portal holds official county property documents including building, sanitation and land use permits, plus other property records and historic information dating back to the 1970s. Sanitation permits are the ones you want.
If you would rather ask a person, the office details are worth writing down before you go:
- Lane County On-Site Wastewater, 3050 N. Delta Hwy, Eugene OR 97408
- (541) 682-4651
- Monday to Friday, 9:00 am to 3:00 pm
- Sanitation staff are available by appointment only — call ahead rather than turning up
What the Permit Record Actually Tells You
A permit is not just proof that someone was allowed to dig. It carries the number that matters most about a septic system, which is how big it is.
DEQ notes that permit records usually indicate the size of the system in gallons per day, and gives the worked example: a four-bedroom home is sized at 450 gallons per day. That is the fact to hold against the house in front of you. A system permitted for a three-bedroom house that now serves five bedrooms and a converted shop is a different proposition from the same system serving what it was designed for.
So read the permit and the listing side by side. If bedrooms have been added since the system went in, that is a question for the county, and a good one to ask before you are under contract rather than after.
There is also an honest limit to what a missing record proves. DEQ states that permits have been required since 1972, and in some counties earlier. A house from 1958 with nothing on file is unremarkable. A house from 1998 with nothing on file is a question.
The Inspection Is a Separate Job
Paperwork tells you what was approved. It does not tell you what is happening underground now, and the two can diverge quietly over thirty years.
DEQ is direct about this: prior to purchasing property with an existing septic system, you should hire a qualified inspector to check out the system. That is the state's own guidance, not a realtor's upsell, and it is the single most useful thing a buyer can do about septic.
Treat it the way you would treat a roof or a foundation — as its own specialist look, on its own timeline, with its own report. A general home inspection is not a septic inspection, and assuming one covers the other is how people end up surprised.
Septic or City Sewer? How to Tell
This is usually the first question, and the sanitation permit record is the cleanest way to answer it. A property served by an onsite system will generally have an onsite wastewater permit on file with the county. A property on city sewer will not.
Do not settle it by looking at the yard, or by where the house sits. Properties inside city limits can still be on septic, and rural properties can be connected to a district system. The record is the answer; the guess is not.
And if the portal comes back empty, that is a reason to call rather than a conclusion to draw. An absent record can mean city sewer, a pre-1972 system, or simply a record that is not where you looked.
What to Do Before You Make an Offer
Pull the sanitation record first — it costs nothing and it tells you what you are dealing with. Then, if there is a system, plan the inspection early enough that its findings can still change what you do.
The order matters more than people expect. A septic inspection booked in the last few days of an inspection period leaves you with a report and no room to act on it, and septic work is not the kind of thing you want to be negotiating against a clock.
If you are looking at rural property around Lane County and want help reading what you find, that is the kind of thing we do every week.
Common questions
- Where Do I Find Septic Records for a Lane County Property?
- With the county, not the state. Oregon DEQ holds online onsite records only for Curry, Jackson and Josephine — plus pre-June 2025 records for Baker, Union and Wallowa — and directs every other county to its local agent. In Lane County that is the Land Management Division's Property Records Online portal, which holds sanitation, building and land use permits back to the 1970s.
- Should I Get a Septic Inspection Before Buying?
- DEQ's own advice is yes: "Prior to purchasing property with an existing septic system, you should hire a qualified inspector to check out the system."
- How Do I Know If a Home Is on Septic or City Sewer?
- The county's sanitation permit record is the reliable answer. A property with a septic system will generally have an onsite wastewater permit on file; a property on city sewer will not. If nothing shows up, call Lane County On-Site Wastewater at (541) 682-4651 rather than assuming.
- When Did Oregon Start Requiring Septic Permits?
- DEQ states that permits have been required since 1972, and in some counties earlier. So an older home with no permit on file usually means the system predates the requirement — or was never permitted at all.
