A buyer under contract on a home near Bull Mountain Road opens the preliminary title report and stops cold at one line: "Sanitary Sewer Reimbursement District No. [X]." No explanation, just a case number and a legal description. The first call almost always goes to the agent, and the question is always some version of the same thing: is this a lien I'm about to inherit?
It isn't. But the reason it isn't matters less than what almost nobody checks next, and that's the part worth slowing down for if you're buying or selling on the unincorporated edges of the hill.
What That Recording Actually Means
Tigard built its sanitary sewer reimbursement district program because a large share of the city, more than 680 residential lots and roughly 80 commercial parcels in the Tigard Triangle, developed without access to public sewer. Many of those homes ran on septic systems that were already decades old by the time the city started addressing the gap. Since then, Tigard has formed more than 50 numbered reimbursement districts and connected over 780 properties to public sewer lines under the program.
Here's the part that catches people off guard. When the city forms a district, it records a notice against every affected property so future buyers know it exists. That recording shows up on a title report and looks, to an untrained eye, exactly like an encumbrance. It isn't. The city's own guidance to real estate professionals is direct on this point: the recording is not a lien, and there's no obligation to connect to the sewer or pay anything toward it unless you decide to hook up voluntarily or your septic system fails and the county won't approve a replacement.
So the notice itself is closer to a heads up than a bill. The clock behind it is where the actual exposure lives.
The Clock Nobody's Watching
Every reimbursement district carries an expiration date, set at 15 years from the date of construction. Once that window closes, the reimbursement option disappears. A property owner whose septic fails after expiration doesn't get the benefit of a shared-cost district anymore. They pay the full cost of a new connection out of pocket, on whatever timeline the county gives them once the existing system is declared unfit.
That distinction changes the math on a home that looks identical on paper.
| Scenario | Who covers the connection cost |
|---|---|
| Septic works fine, district still active | No one, connecting is optional |
| Septic fails, district still active | Owner's reimbursement share only |
| District has expired | Full connection cost, no reimbursement |
Most buyers never ask which column they're in. The title report tells you the district exists. It does not tell you whether the clock has already run out, and that's a question worth answering before you write an offer, not after your inspector finds a saturated drain field.
The Ground Itself Is Different Up Here
Tigard sits across two distinct geologies, and that split runs straight through the septic conversation. The valley floor is built on heavy Tualatin Valley clay, soil that holds water and restricts drainfield percolation, which is part of why so many older systems in that part of the city struggle. Bull Mountain's slopes are a different animal entirely: weathered basalt that offers better bearing capacity for foundations but demands rock-breaking equipment for excavation and retaining walls to manage the grade.
What that means in practice is that a septic inspection on the hill isn't the same exercise as a septic inspection in the flats. A drainfield engineered for clay behaves differently than one sited in rockier, sloped ground, and a system that's been quietly functioning for thirty years on a Bull Mountain lot has been doing so under conditions specific to that lot's grade and rock. A generic pass or fail from a quick inspection doesn't capture that. Ask for the inspector's notes on soil and slope, not just a tank pump-out receipt.
Two Governments, One Property
Adding to the friction: septic systems on unincorporated Bull Mountain fall under Washington County's authority, not the City of Tigard's, even for properties that sit inside a Tigard-formed reimbursement district. If a system needs repair or replacement, the county has to approve it first. That jurisdictional split is easy to miss because the reimbursement district paperwork comes from the city while the actual septic permitting comes from the county. A seller who assumes one call covers both processes can lose weeks they didn't budget for mid-transaction.
The north end of Bull Mountain has been gradually annexed into Tigard city limits over time, and each annexed parcel carries its own history of when, or whether, it moved onto public sewer. Two houses on the same street can have entirely different answers to the septic question depending on when their portion of the hill was brought into the city.
The Maintenance Math
For homes still on private systems, routine pumping typically runs $300 to $600 and is recommended every three to five years. Washington County sees more than 40 inches of rain annually, and that seasonal saturation stresses drain fields hardest during the wet months. If you're a seller planning to list in fall or winter, scheduling a pump-out and inspection before the ground saturates gives you a cleaner report to hand buyers, rather than one completed after weeks of rain have already stressed the system.
Where This Lands in the Current Market
Based on MLS-sourced data refreshed in July 2026, established Bull Mountain-area homes from the 1970s through the 1990s, concentrated off Walnut Street and Bull Mountain Road, are trading in the $525,000 to $750,000 range. That segment continues to move faster than Tigard's condo and townhouse market, with fewer days on market and sale prices holding close to asking. In a market moving that quickly, buyers often waive or shorten inspection contingencies to stay competitive, which is exactly when a septic and district status check matters most. There isn't much room to discover an expired reimbursement window after you've already removed contingencies.
Before You Write an Offer
- Ask the seller directly whether the home is on public sewer or private septic, and if septic, when it was last pumped and inspected.
- Pull the property's reimbursement district status through the county recorder or ask your title company to confirm both the district number and its construction date.
- Calculate where that date lands against the 15-year window. If it's close to expiring, factor a potential future connection cost into your offer strategy.
- Request the septic inspector's notes on soil type and drainfield placement, not just a tank service record.
- Confirm which agency, city or county, would need to approve any future repair, since the two don't always communicate on the same timeline.
Frequently Asked Questions
Does every home on Bull Mountain have a septic system? No. Portions of the hill have been annexed into Tigard and connected to public sewer over time, while other parcels, particularly those that remain unincorporated, may still run on private septic. It varies lot by lot.
Is a sewer reimbursement district recording the same as a lien? No. It's a notice required by city code so future buyers know the district exists, but it creates no payment obligation unless the owner chooses to connect or the septic system fails and the county won't permit a replacement.
What happens if the septic fails after the reimbursement district has expired? The owner at that time covers the full cost of connecting to public sewer. There's no shared-cost benefit once the 15-year window has closed, which is why confirming the district's age matters more than confirming it exists.
If you're weighing an offer on a Bull Mountain property, or preparing to list one that's still on septic, these are exactly the kinds of details worth sorting out before they become a mid-escrow surprise. Julie Williams has spent years walking Westside buyers and sellers through the parts of a transaction that don't show up on a listing sheet. Schedule a consultation to talk through what your specific property needs before you're under a deadline to figure it out.
