San Juan County, WashingtonProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- February 2026; San Juan County says the Treasurer mails tax bills in February after taxing-district budgets and levy rates are approved; no exact day was published.
- Payment deadline
- 2026: first-half or full payment due April 30, 2026 (full payment is due by April 30 when the annual tax is $50 or less); second half due October 31, 2026; mailed payments are timely by the applicable postmark.
Exemptions & appeals
Exemption filing
December 31, 2025 for a 2026 assessment-year Senior/Disabled exemption under the Washington application schedule; the county accepts applications and supporting documents through the Assessor.
Senior relief
San Juan County's 2024-2026 Senior Citizens and People with Disabilities program lists a maximum combined disposable income of $49,000, with ownership/occupancy and age 61+ or qualifying disability requirements. The program exempts excess levies and provides tiered regular-levy relief; information and 2026 forms: https://sanjuancountywa.gov/1652/SNR-DSBL-Tax-Relief-Prog
Valuation limits
Washington has no individual parcel assessed-value cap. County assessors value property at 100% of true and fair market value; regular taxing-district levy revenue is generally limited to a 1% annual increase plus new construction under RCW 84.55, subject to voter-approved lid lifts and other statutory rules. The 1% constitutional levy limit constrains aggregate regular levies, not an individual parcel's value.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →