Property Taxes in Bethel Island, California
Median Bethel Island, California effective property tax rate: 1.37%, significantly higher than the national median of 1.02%, and higher than the California state median of 1.21%.
Median Bethel Island, California home value: $422,145
Median annual Bethel Island, California tax bill: $5,602, $3,202 higher than the national median property tax bill of $2,400.
How are property taxes in Contra Costa calculated?
Property taxes in Bethel Island, California 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 Bethel Island's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Bethel Island, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Bethel Island Property Tax Calculator Work?
Use this Bethel Island property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Bethel Island's median effective tax rate of 1.37% — based on actual property records in Contra Costa 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 Bethel 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 Bethel Island: rates range from 1.37% in 94511 to 1.37% in 94511, primarily due to differences in school district levies and local assessment districts.
If your estimate is higher than expected, Ownwell can appeal your Bethel Island assessment — you only pay if we save you money.
About Bethel Island Property Taxes
About Property Taxes in Bethel Island, Contra Costa, California
Bethel Island’s median effective property tax rate of 1.37% is higher than the California state median of 1.21% and higher than the national median of 1.02%. This rate reflects the Contra Costa County base levy combined with local school district levies and Mello-Roos Community Facility Districts that vary by subdivision throughout the city.
Property tax rates are not uniform across Bethel Island. Homeowners in the 94511 ZIP code carry a median effective rate of 1.37%, while those in the same ZIP code pay 1.37%. This spread reflects how school district boundaries and local assessment districts are drawn across Contra Costa County. Understanding which part of Bethel Island you live in can make a meaningful difference to your annual tax bill.
Bethel Island homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the December 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 Bethel Island, Contra Costa County, California
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 Bethel Island's effective property tax rate to other cities in California and the median property tax rates in California and the U.S.
Property Tax Rates Across Bethel Island, Contra Costa County, California
Source: Ownwell
1.05%
1.46%
1.87%
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 Bethel Island Tax Rate
1.37%
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 Contra Costa County Tax Rate
1.31%
Median Effective California Tax Rate
1.21%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Bethel Island, Contra Costa County, California
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 94511 | 0.94% | 1.20% | 1.37% | 1.71% | 2.03% |
Source: Ownwell
Save on Your Property Taxes and More With Ownwell
$774
Average Annual Tax Savings
Property Tax Assessment Values Across Bethel Island, Contra Costa County, California
When examining property taxes in Bethel Island, California, 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 Contra Costa 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 Contra Costa 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. For Bethel Island, the median home price is $422,145, with a median tax bill of $5,602. Tax bills range significantly across the county, from $2,726 at the 25th percentile to $23,322 at the 90th percentile.
Property Tax Assessment Values Across Bethel Island, Contra Costa County, California
Source: Ownwell
$153,114
$1,176,704
$2,200,294
Median Bethel Island Market Value
$422,145
Median Contra Costa County Market Value
$530,390
Median California Market Value
$427,605
Median United States Market Value
$274,101
Property Tax Assessment Values Across Bethel Island, Contra Costa County, California
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 94511 | $22,022 | $151,698 | $422,145 | $779,994 | $1,352,854 |
Source: Ownwell
Save on Your Property Taxes and More With Ownwell
$774
Average Annual Tax Savings
Property Tax Bills Across Bethel Island, Contra Costa County, California
Property tax bills in Bethel Island are based on the assessed value of a home and the local tax rate set for Contra Costa County. When a property’s assessed value rises, the tax bill can increase as well, which means homeowners with similar homes may still pay very different amounts depending on their assessment and location. With a median home price of $422,145, the property tax burden can be significant, especially when compared with the national median property tax rate of 1.02% and the national median property tax bill of $2,400.
For many homeowners, the tax bill is a major part of annual housing costs. In Bethel Island, the tax bill at the 25th percentile is $2,726, while the 75th percentile reaches $11,713 and the 90th percentile climbs to $23,322. Ownwell can help homeowners review their assessed value, identify potential savings, and file a property tax appeal when a home appears overassessed. That can lower the bill and help homeowners keep more money in their pocket.
Property Tax Bills Across Bethel Island, Contra Costa County, California
Source: Ownwell
$3,003
$13,751
$24,499
Median Bethel Island Tax Bill
$5,602
Median Contra Costa County Tax Bill
$6,979
Median California Tax Bill
$5,134
Median United States Tax Bill
$3,209
Property Tax Bills Across Bethel Island, Contra Costa County, California
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 94511 | $196 | $2,726 | $5,602 | $11,713 | $23,322 |
Source: Ownwell
Save on Your Property Taxes and More With Ownwell
$774
Average Annual Tax Savings
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Property Valuation Date | January 1 |
| Appeal Deadline | November 30 |
| Tax Bill | |
| Issued | October 1 |
| Due Date #1 | December 10 |
| Due Date #2 | April 10 |
Links | |
|---|---|
| Contra Costa Tax Assessor | |
| Website | www.contracosta.ca.gov |