Washington County, PA follows the Pennsylvania statutory schedule. This page shows that schedule, the county's own website, and the late penalty — the county can still set its own dates, so confirm before you pay.
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…until annual (county) — May 1, 2027
Instalment
Due date
Notes
Annual (county)
May 1, 2027
No statewide due date: each taxing district sets one by its tax notice, and the common county cycle runs a 2% discount through about March 31 and the face amount through April 30.
Schedule: dced.pa.gov · Pennsylvania statute · not yet county-verified
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Statewide schedule — read this before you rely on it
Very high: the Local Tax Collection Law keys the discount and penalty periods to the date printed on each district's notice rather than a calendar date, so deadlines differ by county, city and school district. Variation between counties here is high — treat the dates above as a starting point only.
A penalty of up to 10% is added once four months have passed from the date of the tax notice, after which the tax is delinquent and subject to lien; payment within the first two months earns a discount of at least 2%.
Each county, municipality and school district issues its own tax notice, with county bills typically mailed in January or February and school district bills in July.
Washington County at a glance
Population: 210,232 (Census estimate, 2023) — the 18th largest of 67 Pennsylvania counties and county equivalents.
Typical tax bill: $2,374 a year (median for owner-occupied homes, ACS 2022 5-year estimate) — the Pennsylvania median is $3,187.
Land area: 857 sq mi, about 245.3 people per sq mi.
On a $400,000 purchase in Washington County, PA, property tax comes to about $4,368 a year — roughly $364 a month — at this county's effective rate of 1.09%.
$
Effective rate 1.09% = this county's median owner-occupied tax bill ($2,374, ACS 2022 5-year estimate) divided by the typical home value at the time ($217,301, Zillow, 2022-12-31). Exemptions the seller holds — homestead, senior, veteran — usually do not transfer with the deed, so a new purchase can run above this figure. The county assessor sets the assessed value; this is an estimate, not a quote.
How to pay Washington County property tax
County website:www.co.washington.pa.us — start here for the treasurer or tax collector page.
By post: mail to the county treasurer; the postmark usually counts, not the arrival date.
In person: the treasurer's office, with your bill or parcel number.
Escrow: if your mortgage escrows taxes, the servicer pays — you still owe any shortfall.
Is this county verified?
Not yet. Washington County is on the queue: we publish a county's own published dates once they have been checked against the county website. Ask for it and it moves up. Until then, the Pennsylvania statutory schedule above is the reliable starting point.
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CountyTaxDates is an independent reference and is not a government agency. Deadlines change and exceptions apply — always confirm with your county treasurer using the official link on this page. Nothing here is tax, legal or financial advice.