Washington County Property Tax Appeal — Deadline and How to File
The deadline
Filing deadline
August 1
per the Washington County Board of Assessment Appeals' Rules of Appeal Procedures, checked 2026-09-10 — source
Who hears it, and where it goes
Your appeal is decided by the Washington County Board of Assessment Appeals.
Where to file
Washington County Board of Assessment Appeals95 West Beau Street, Suite 525
Washington, PA 15301
The form: General Assessment Appeal Form.
Filed by mail or in person, weekdays 9:00 a.m. to 4:30 p.m..
A mailed appeal that arrives late still counts if it was postmarked by the deadline.
per the Washington County Board of Assessment Appeals' General Assessment Appeal Form, checked 2026-09-10 — source
Nearby counties
- Allegheny County — Board of Property Assessment Appeals and Review
- Westmoreland County — Westmoreland County Board of Assessment Appeals
- Butler County — Butler County Board of Assessment Appeals
- Armstrong County — Armstrong County Board of Assessment Appeals
- Indiana County — Indiana County Board of Assessment Appeals
- Venango County — Venango County Board of Assessment Appeals
More: the county index and the Pennsylvania guide.
What your assessed value means here
Pennsylvania — assessed at a base-year value; the STEB Common Level Ratio for your county is about 68.03% of current market. Confirm the ratio on your notice (53 Pa.C.S. §8854).
Washington County's common level ratio is drawn from the 2025 CLR (2024 sales data; effective 7/1/2026–6/30/2027) table — the same figure the app uses to compare your assessment to current market value.
Can the board raise your assessment?
Yes. The Washington County Board of Assessment Appeals can raise your assessment on your own appeal, not only lower it. That is the risk you take by filing, and it is why the case has to be worth making before you file it.
What a board actually weighs
The Washington County Board of Assessment Appeals decides what your property was worth on the valuation date, so recent comparable sales carry the case, not the size of the bill. The Pennsylvania guide covers the evidence.
Common questions
- When is the deadline to appeal my property assessment in Washington County?
- The deadline is August 1 — per the Washington County Board of Assessment Appeals' Rules of Appeal Procedures, checked 2026-09-10.
- Who decides my appeal in Washington County?
- The Washington County Board of Assessment Appeals.
- Where do I send my appeal in Washington County?
- To the Washington County Board of Assessment Appeals, 95 West Beau Street, Suite 525, Washington, PA 15301 — per the Washington County Board of Assessment Appeals' General Assessment Appeal Form, checked 2026-09-10. The form is the General Assessment Appeal Form.
Sources
Property tax rules and deadlines vary by jurisdiction and can change — verify with your county before relying on this.
PROppeal is coming soon for Washington County
When it launches, PROppeal will check your case against real, recent comparable sales and give you an honest verdict — then build the board-ready letter to file — $29.99, no percentage of your savings.
Want a heads-up when it’s live? Email [email protected].