Walla Walla County Property Tax Appeal Guide
In Walla Walla County, file your appeal by File a Taxpayer Petition with the county Board of Equalization by July 1 of the assessment year, OR within 30 days of the date the assessor mailed the change-of-value notice (some counties adopt an extended window of up to 60 days by ordinance), whichever is later. Confirm the exact window with the Board of Equalization in the county where the property is located. at Walla Walla County Assessor's online portal.
| Deadline | File a Taxpayer Petition with the county Board of Equalization by July 1 of the assessment year, OR within 30 days of the date the assessor mailed the change-of-value notice (some counties adopt an extended window of up to 60 days by ordinance), whichever is later. Confirm the exact window with the Board of Equalization in the county where the property is located. |
|---|---|
| Lien date | January 1, 2026 |
| Appeal body | County Board of Equalization (BOE) |
| Assessor / district | Walla Walla County Assessor |
| Online portal | File online |
How to File a Appeal in Walla Walla County
- Gather your assessment notice — it lists your account number and any access code
- File online through Walla Walla County Assessor's portal or by mail
- State your grounds and submit evidence (comparable sales, a licensed appraisal, or photos of defects)
- Request an informal review to try to settle before a formal BOE hearing