Decatur Island, San Juan County, Washington Property Taxes

$774 avg. annual savings

No Upfront Costs

You only pay if we save

Property Taxes in Decatur Island, Washington

Median Decatur Island, Washington effective property tax rate: 0.42%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Decatur Island, Washington home value: $607,910
Median annual Decatur Island, Washington tax bill: $2,469, $69 higher than the national median property tax bill of $2,400.

How are property taxes in San Juan calculated?

Property taxes in Decatur Island, 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 Decatur Island's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Decatur Island, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Decatur Island, San Juan County, Washington Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.42%

Estimate Property Tax Bill

$2,553

$2,369

$774

Average Annual Tax Savings

How Does the Decatur Island Property Tax Calculator Work?

Use this Decatur Island property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Decatur Island's median effective tax rate of 0.42% — based on actual property records in San Juan County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local assessment 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 Decatur Island'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 Decatur Island: rates range from 0.42% in 98221 to 0.42% in 98221, primarily due to differences in school district levies and local assessment districts.

Decatur Island's median property tax bill is $2,469, which is lower than San Juan County and lower than the Washington state median tax rate of 0.92%, while the state's median bill is $69 higher than Decatur Island's. If your estimate is higher than expected, Ownwell can appeal your Decatur Island assessment — you only pay if we save you money.

About Decatur Island Property Taxes

About Property Taxes in Decatur Island, San Juan, Washington

Decatur Island's median effective property tax rate of 0.42% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the San Juan 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 Decatur Island. Homeowners in the 98221 ZIP code carry a median effective rate of 0.42%, while those in the same ZIP code pay 0.42%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across San Juan County. Understanding which part of Decatur Island you live in can make a meaningful difference to your annual tax bill.

Decatur Island homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the November 5, 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 Decatur Island, San Juan 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 Decatur Island's effective property tax rate to other cities in Washington and the median property tax rates in Washington and the U.S.

Property Tax Rates Across Decatur Island, San Juan County, Washington

Source: Ownwell

0.38%

0.49%

0.60%

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 Decatur Island Tax Rate

0.42%

Median Effective San Juan County Tax Rate

0.57%

Median Effective Washington Tax Rate

0.92%

Median Effective United States Tax Rate

1.27%

Property Tax Rates Across Decatur Island, San Juan County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
98221	0.41%	0.41%	0.42%	0.43%	0.45%

Source: Ownwell

Save on Your Property Taxes and More With Ownwell

$774

Average Annual Tax Savings

Property Tax Assessment Values Across Decatur Island, San Juan County, Washington

When examining property taxes in Decatur Island, 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. The San Juan County appraisal district 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:

In San Juan County, assessment notices are sent in the spring each year. They’ll typically reach your mailbox by the middle of October.

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. The median home price in Decatur Island is $607,910, with a median tax bill of $2,469. For comparison, the national median property tax rate is 1.02% and the national median property tax bill is $2,400.

Property Tax Assessment Values Across Decatur Island, San Juan County, Washington

Source: Ownwell

$324,480

$776,078

$1,227,675

Median Decatur Island Market Value

$607,910

Median San Juan County Market Value

$798,910

Median Washington Market Value

$501,600

Median United States Market Value

$274,101

Property Tax Assessment Values Across Decatur Island, San Juan County, Washington

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
98221	$250,754	$399,450	$607,910	$910,760	$1,214,100

Source: Ownwell

Save on Your Property Taxes and More With Ownwell

$774

Average Annual Tax Savings

Property Tax Bills Across Decatur Island, San Juan County, Washington

Property tax bills in Decatur Island are calculated by multiplying a home’s assessed value by the local tax rate, then adjusting for exemptions and other factors that may apply. For homeowners, the size of the bill depends on the market value of the property and how local taxing authorities assess it. With a median home price of $607,910, property taxes can become a meaningful part of owning a home, especially when assessments rise faster than expected.

In San Juan County, the median property tax bill is $2,469, which is above the national median property tax bill of $2,400 and reflects a higher-than-average tax burden. Bills can vary widely, with the 25th percentile at $1,682 and the 75th percentile at $3,755, while the 90th percentile reaches $4,961. Ownwell helps homeowners challenge inaccurate assessments and pursue exemptions, which can lower property tax bills and reduce what you pay each year.

Property Tax Bills Across Decatur Island, San Juan County, Washington

Source: Ownwell

$1,236

$3,903

$6,570

Median Decatur Island Tax Bill

$2,469

Median San Juan County Tax Bill

$4,329

Median Washington Tax Bill

$4,512

Median United States Tax Bill

$3,209

Property Tax Bills Across Decatur Island, San Juan County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
98221	$1,048	$1,682	$2,469	$3,755	$4,961

Source: Ownwell

Save on Your Property Taxes and More With Ownwell

$774

Average Annual Tax Savings

Don't miss the deadline to appeal!

Dates
Appeal Deadline	October 8
Tax Bill
Issued	February 10
Due Date #1	April 30
Due Date #2	October 31

Links
San Juan Tax Assessor
Website	parcel.sanjuancountywa.gov

Frequently Asked Property Tax Questions in Decatur Island, Washington

How are property taxes calculated in Decatur Island, Washington?

Property taxes in Decatur Island, Washington are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in Decatur Island, Washington?

To appeal your property taxes in Decatur Island, Washington, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in Decatur Island, Washington?

Common property tax exemptions in Decatur Island, Washington include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in Decatur Island, Washington?

Property tax deadlines in Decatur Island, Washington vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in Decatur Island, Washington?

Ownwell provides professional property tax appeal services in Decatur Island, Washington. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.