Underground Oil Tank Locating
Oregon home inspections exclude underground items · Seller disclosure runs on knowledge, not diligence · Tanks sit around two feet down and two feet from the house
A survey to establish whether a buried heating oil tank is present on a Eugene or Springfield property, sized to fit a purchase inspection period. Pipe trace first, then instrument survey, with a written report that states exactly what was covered and what was not.
Quote this service
Tank size, depth, access, contamination risk. Site survey is free.
What this service covers
A buried oil tank is one of the few significant defects that a Eugene purchase can run straight past without anyone behaving badly. The general inspection does not cover it, because Oregon's home inspector standards exclude underground items from what an inspector must report on. The seller may not be concealing anything either, since the property disclosure is answered on actual knowledge and a seller who inherited the house genuinely may not know. Two honest parties, a complete paper trail, and a tank still in the ground.
That is the gap this survey exists to close, and DEQ says as much, recommending a buyer hire someone to check where the owner does not know. The stakes are asymmetric: responsibility for a release follows the property, so a buyer who closes on an unassessed tank inherits whatever is under it.
The work itself is less exotic than the marketing around it suggests. Most Eugene tanks announce themselves through pipework before any instrument comes out of the van. DEQ describes the typical heating oil tank as 46 inches across, four to eight feet long, sitting about two feet below the surface and within roughly two feet of the building it once served. That is a small, shallow, predictable target close to the house, and the pipes that fed it usually sit within five to ten feet of it. Instruments confirm and pinpoint what the pipe evidence suggests. Where nothing is found, the honest output is a documented negative with its limits stated, not a clean bill of health. If a tank does turn up, removing or abandoning it is a separate job and we will quote it separately rather than folding it into the survey.
How we run this service
Pipe evidence first, instruments second
The vent pipe is the single most reliable indicator and it is usually in plain sight. We work the exterior walls, the crawl space, and the foundation penetrations before running any survey grid, because a located fill and vent pair narrows the search to a few square yards and makes everything after it more reliable.
Magnetic survey sized to the real target
A steel tank two feet down is a large ferrous mass at shallow depth, which is close to ideal for magnetic detection. The known weakness is interference, since fences, vehicles, buried pipework and reinforcement all register. We clear and note what is on site rather than reporting every anomaly as a possible tank.
Radar used where it earns its place
Ground penetrating radar can see tanks that hold no iron, which magnetic methods never will. Its penetration falls away in the clay-rich soils common across the valley floor, so we treat it as the tool for a specific question rather than the centrepiece. Any operator selling radar as a guarantee is overselling the physics.
A report that admits its own limits
The written output states the area surveyed, the methods used, what obstructed coverage, and what that leaves unresolved. Driveways, decking, outbuildings and dense planting all restrict access, and a report that quietly omits them is worth nothing to a buyer trying to make a decision.
Who this service fits
A locate is worth ordering when one of these is true:
- i.You are under contract on a Eugene or Springfield house built before the mid-1970s and the inspection period is running.
- j.The seller disclosure answers the tank question with "Unknown" and nobody can say more.
- k.There is a capped pipe stub, an unexplained vent against the wall, or a patch of lawn that behaves differently from the rest of it.
- l.You are listing a property and would rather find out now than have a buyer's surveyor find out during your inspection period.
- m.You are converting off oil heat and want to know what remains in the ground before the new system goes in.
How a job runs, start to finish
Site walk and pipe trace
Exterior walls, crawl space, basement, and foundation penetrations. We photograph any fill or vent pipe, capped stub, or surface anomaly and map where the evidence points before deciding what survey the property actually needs.
Instrument survey
Magnetic survey across accessible ground on a grid, with radar where soil and surface conditions make it useful. Known interference is recorded as it is encountered so the anomalies in the report can be read properly rather than taken at face value.
Confirmation
Where an anomaly is consistent with a tank, careful probing confirms depth and extent. DEQ endorses the technique and also warns to avoid pushing hard enough to puncture the shell, which is exactly why it is a confirmation step and not a search method.
Written report
Findings, the area covered, the methods used, access limitations, and photographs. Written to be handed to an agent, a lender, or the other side of the transaction without further explanation.
What this service includes
A locate covers the exterior pipe trace around the full perimeter, crawl space and basement inspection for supply-line stubs and abandoned penetrations, magnetic survey of accessible ground with interference logged as it is found, ground penetrating radar where surface and soil conditions justify it, careful probe confirmation of any anomaly consistent with a tank, and a photographed written report stating the surveyed area and its limits. Neighboring properties of the same era are noted as context, since DEQ itself suggests that homes built around the same time are an indicator worth weighing. Where a tank is confirmed, we set out the options and price them separately rather than assuming the work. Where nothing is found, the report says what was covered and what was not, because the areas a survey could not reach are the part a buyer actually needs to see. Records checking is a different exercise and does not substitute for a physical survey, since a tank that was never registered leaves no trace in any database.
Underground Oil Tank Removal
Excavate, decommission, and document buried heating oil tanks across Eugene-Springfield under the Oregon DEQ HOT program. Closes with an ORELAP-tested soil sample panel and a Decommissioning Report filed at the Eugene DEQ office.
View service →Underground Oil Tank Locating: Common questions
Does a standard home inspection cover buried oil tanks?+
No. Oregon's home inspector standards specifically exclude underground items from what an inspector is required to report on, and a buried tank is an underground item. A tank survey is a separate scope ordered separately. Buyers regularly assume the general inspection covered it, and find out otherwise after closing.
The seller ticked "Unknown" on the tank question. Is that allowed?+
Yes, and it is often honest. Oregon's seller property disclosure is based on the seller's actual knowledge, so a seller who genuinely does not know can answer "Unknown" and has told the truth as the statute requires. The related duty to empty an abandoned tank at sale also attaches to a tank known to be on the property. That is precisely the gap a physical survey exists to close.
If the scan finds nothing, does that guarantee there is no tank?+
No, and be wary of anyone who says otherwise. Every survey method has conditions that defeat it. Our report states the area actually covered, the method used, and what would have limited it, so you can see the shape of the finding rather than a bare "no tank found". A clear result narrows risk considerably; it does not eliminate it, and we will not write it up as though it does.
Why does soil type matter in the Willamette Valley?+
Ground penetrating radar is the method that can see non-metallic tanks, but its depth of penetration drops in conductive clay-rich soils, and Willamette Valley soils carry meaningful clay content. That is why we do not rely on a single instrument. Pipe evidence and magnetic survey do the heavy lifting on most Eugene properties, with radar used where it adds something rather than as a headline feature.
What are the visible signs I can check myself before calling?+
Start with the vent pipe. DEQ notes it is almost always visible, roughly 1.25 to 1.5 inches across, running up the side of the house and standing two to eight feet above ground with a small cap. The fill pipe sits near the ground and often disappears under grass and planting once a tank is abandoned, so its absence proves nothing. Where both exist, the tank is usually within five to ten feet of them. Capped copper or iron stubs through the foundation are worth noting too, though they can equally mean a basement tank that was removed.
How does this fit a purchase timeline?+
It belongs in the inspection period, alongside the general inspection rather than after it. If a tank is found, you still have room to negotiate who deals with it. If soil sampling becomes part of the picture, DEQ advises that site assessment results should not be relied on for more than 90 days, so timing the work close to closing rather than months ahead is deliberate.
Ready to talk about your specific tank?
Free site survey. Fixed-price quote. Decommissioning Report filed at the Eugene DEQ office.