Property Taxes in Mattawa, Washington
Median Mattawa, Washington effective property tax rate: 0.96%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Mattawa, Washington home value: $188,000
Median annual Mattawa, Washington tax bill: $1,718, $682 lower than the national median property tax bill of $2,400.
How are property taxes in Grant calculated?
Property taxes in Mattawa, Washington are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.
Understanding Mattawa's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Mattawa, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Mattawa Property Tax Calculator Work?
Use this Mattawa property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Mattawa's median effective tax rate of 0.96% — based on actual property records in Grant County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Mattawa's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Your bill may vary by ZIP code within Mattawa: rates range from 1718.00 in 99349 to 1718.00 in 99349, primarily due to differences in school district levies and local assessment districts.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Mattawa.
About Mattawa Property Taxes
About Property Taxes in Mattawa, Grant, Washington
Mattawa's median effective property tax rate of 0.96% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the Grant County base levy combined with local school district levies and Local improvement districts (LIDs) that vary by subdivision throughout the city.
Property tax rates are not uniform across Mattawa. Homeowners in the 99349 ZIP code carry a median effective rate of 0.96%, while those in the 99349 pay 0.96%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Grant County. Understanding which part of Mattawa you live in can make a meaningful difference to your annual tax bill.
Mattawa homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the July 1, 2026 deadline each year.
If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across Mattawa, Grant County, Washington
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare Mattawa's effective property tax rate to other cities in Washington and the median property tax rates in Washington and the U.S.
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Mattawa Tax Rate
0.96%
Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.
Median Effective Grant County Tax Rate
1.12%
Median Effective Washington Tax Rate
0.92%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Mattawa, Grant County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 99349 | 0.84% | 0.96% | 0.96% | 0.97% | 0.98% |
Source: Ownwell
Property Tax Assessment Values Across Mattawa, Grant County, Washington
When examining property taxes in Mattawa, Washington, understanding the distinction between market value and assessed value is crucial.
The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. Grant County estimates the market value for tax purposes.
The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.
Assessment notices are sent in the spring each year and typically reach your mailbox by the middle of the month. Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill.
For example, the median home price in Mattawa is $188,000, with a median tax bill of $1,718. That is below the national median property tax bill of $2,400. The highest median home price is in 99349 at $188,000.
Property Tax Assessment Values Across Mattawa, Grant County, Washington
Source: Ownwell
$24,000
$127,565
$231,130
Median Mattawa Market Value
$188,000
Median Grant County Market Value
$160,157
Median Washington Market Value
$501,600
Median United States Market Value
$274,101
Property Tax Assessment Values Across Mattawa, Grant County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 99349 | $9,486 | $69,745 | $188,000 | $303,898 | $431,256 |
Source: Ownwell
Property Tax Bills Across Mattawa, Grant County, Washington
Mattawa property tax bills are based on the assessed value of a home and the local tax rates set by taxing authorities in Grant County. For a home with a median market value of $188,000, the tax bill can vary widely depending on location, exemptions, and how the property is assessed.
The typical bill is shaped by the taxable value of the home, which is then multiplied by the applicable rate to determine what a homeowner owes. In Mattawa, the 25th percentile tax bill is $668, while the 75th percentile is $2,878 and the 90th percentile reaches $4,103. The median tax bill in ZIP code 99349 is $1,718, which is below the national median property tax bill of $2,400 and the national median property tax rate of 1.02%.
For homeowners, this means property taxes can be a meaningful part of annual housing costs, especially when assessed values rise or exemptions are not applied.
Median Mattawa Tax Bill
$1,718
Median Grant County Tax Bill
$1,689
Median Washington Tax Bill
$4,512
Median United States Tax Bill
$3,209
Property Tax Bills Across Mattawa, Grant County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 99349 | $68 | $668 | $1,718 | $2,878 | $4,103 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | July 1 |
| Tax Bill | |
| Issued | February 10 |
| Due Date #1 | April 30 |
| Due Date #2 | October 31 |
Links | |
|---|---|
| Grant Tax Assessor | |
| Website | grantwa-taxsifter.publicaccessnow.com |