Portland Home Seller Disclosure Requirements (2026)
Oregon's Seller's Property Disclosure Statement is mandatory for Portland sellers. Underground oil tanks, landslide risk, and the Willamette River corridor's flood exposure are the most Portland-specific disclosure issues.
Oregon SPDS Framework
Oregon Revised Statutes 105.462–105.490 govern the disclosure requirement. Sellers must complete the Oregon Seller's Property Disclosure Statement and deliver it to buyers within 10 days of entering a contract. Buyers then have 5 business days after receipt to rescind.
The SPDS asks sellers to respond "Yes," "No," "Unknown," or "NA" to questions about known property conditions. Answering "Unknown" is permissible but strategic — buyers may use "Unknown" answers as a basis for extensive inspection contingencies.
Underground Oil Tank Disclosure
This is Portland's most unique and potentially consequential disclosure issue. Older Portland homes frequently have abandoned USTs (underground storage tanks) from oil heat systems used prior to widespread natural gas adoption.
Required disclosure: If you know or suspect your property has a UST, disclose it on the SPDS. Oregon law requires disclosure of known environmental hazards including USTs.
Discovery at inspection: Buyers' inspectors increasingly use magnetometers to detect buried metal tanks. Discovery at inspection — which you could have disclosed upfront — creates significant renegotiation leverage for buyers.
If a tank is present and leaking: Oregon DEQ has programs and requirements for leaking UST remediation. A leaking tank may require extensive soil remediation and can cause closings to fall through if not disclosed and addressed upfront.
Proactive tank scan: For homes built before 1975 that have converted to natural gas, a pre-listing scan ($300–$600 from a tank scanning company) provides definitive information. If no tank: include the scan report in your disclosure package. If a decommissioned tank: provide any documentation you have and disclose its presence.
Landslide Risk in the West Hills
Portland's West Hills (SW Portland neighborhoods, Hillsdale, Multnomah Village adjacent hillsides, and areas of NW Portland) have documented landslide risk. Oregon's 1996 flooding and landslide events, and the 2015 storm-triggered landslides, affected properties throughout the West Hills.
The Oregon Department of Geology and Mineral Industries (DOGAMI) publishes landslide hazard maps. If your property is in a mapped landslide hazard area:
Flooding Along the Willamette
The Willamette River corridor through Portland has FEMA-designated flood zones. Properties along the east bank (parts of the Pearl District, Old Town, inner NE), on Ross Island, and in some SE Portland lowlands near Johnson Creek have flood exposure.
Oregon SPDS requires disclosure of FEMA Special Flood Hazard Area status and any prior flooding. Check msc.fema.gov for your property's current zone.
Johnson Creek flooding: SE Portland's Johnson Creek has a well-documented flooding history that has affected neighborhoods including Woodstock, Sellwood, Lents, and Brentwood-Darlington. If your property has been affected by Johnson Creek flooding or is in the flood risk area, disclose it.
HOA and Condo Disclosures
Oregon's condo and planned community law (ORS 100.005 et seq.) requires disclosure of HOA governing documents, financials, and any pending special assessments. For Portland condo sales, the seller must provide:
Oregon condos in buildings 3 stories or taller may be subject to building safety maintenance requirements. Portland has had some high-profile condo building safety issues (not at the Florida Surfside level, but building maintenance and reserve fund adequacy are ongoing concerns in older Portland buildings).
Lead Paint — Portland's 1900–1960 Bungalow Stock
Portland has abundant early 20th century housing stock — Craftsman bungalows, Four-Squares, and Victorian/Edwardian homes from the 1900–1930 era are common in neighborhoods like Alberta, Irvington, Ladd's Addition, Hawthorne, and Sellwood. These homes universally have lead paint. Federal disclosure requirements apply.