2026 Property Tax Due Dates
April 30
First half
October 31
Second half
Payment Methods
Online, Mail, In-Person
Grant County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Grant County Treasurer — P.O. Box 37, Ephrata, WA 98823
In Person
Visit the Treasurer's office — 35 C Street Northwest, Ephrata WA 98823, Mon-Fri 8am - 5pm
About Property Taxes in Washington
Washington State property taxes are administered at the county level. Property is assessed at 100% of its true and fair market value as of January 1. Washington levies both a state property tax (used for schools) and local taxes (county, city, school district, fire district, and others). The combined rates vary significantly by county. Washington's property tax system has strong protections for seniors and low-income homeowners, including an exemption that reduces or eliminates taxes for qualifying households regardless of property value.
Payment & Assessment
Washington property taxes are paid in two equal installments: First half: Due April 30 Second half: Due October 31 If the total tax is under $50, the full amount is due April 30. An interest charge of 12% per year applies to late payments, plus a 3% penalty on the first half and 8% on the second half if unpaid. Most counties offer online payment through the county treasurer's website. Contact your county for payment options.
Statewide framework for Washington. Your county's specific rates and deadlines are shown above.
Other Counties in Washington
About Grant County
Grant County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 99,123. The county seat is Ephrata, and the largest city is Moses Lake. The county was formed out of Douglas County in February 1909 and is named for U.S. President Ulysses S. Grant.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.