Contra Costa County, CA Property Taxes (2026)
Contra Costa County owners pay a median of $6,903 a year on a median home value of $830,800, an effective rate of 0.83%. That's the 4th-highest rate of 58 California counties with Census data, above the California county median of 0.70%.
Updated October 2026 · Data: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023)
Is your Contra Costa appraisal too high?
TaxDrop One is a $129 self-serve filing packet for Contra Costa County. You file the appeal; we prepare the evidence packet.
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Effective tax rate
0.83%
4th highest of 58 in CA
Median annual bill
$6,903
~$575/month
Median home value
$830,800
California county median
0.70%
Effective rate
What a protest could save you in Contra Costa County
Enter the market value from your appraisal notice. We apply Contra Costa County's 0.83% effective rate and a 10–15% reduction, the typical range for successful protests.
- Est. annual tax
- $6,896
- Savings at 10–15% off
- $690–$1,034
Contra Costa County vs. California vs. U.S. property tax rates
Key stat: Contra Costa County's effective property tax rate is 0.83%, vs. 0.70% for the median California county and 0.84% for the median U.S. county. It ranks 4th of 58 in California. Effective rate = median tax bill ÷ median home value, so it already reflects typical exemptions. (Source: U.S. Census Bureau, American Community Survey 5-Year Estimates (2019–2023))
How to appeal your property taxes in Contra Costa County
- 1
Review your assessment notice
Check the assessed value from the Contra Costa County Assessor. Compare it to recent sales of similar homes nearby.
- 2
File your appeal before the deadline
The Contra Costa County deadline is July 2 – November 30. Missing it means waiting until the next assessment year.
- 3
Gather evidence
Recent comparable sales, photos of condition issues, repair estimates or an independent appraisal.
- 4
Present your case
Submit evidence or attend a hearing with the County Assessor.
- 5
Get your decision
If you win, your assessed value and bill go down. On a $6,903 bill, 10–15% off is $690–$1035 a year.
Contra Costa County property tax appeal guide →
TaxDrop One: $129 self-serve appeal packet
TaxDrop One is a $129 self-serve filing packet for Contra Costa County. You file the appeal; we prepare the evidence packet.
Check my assessmentProperty tax exemptions in California
California homeowners may qualify for exemptions that reduce taxable value. Check with the Contra Costa County Assessor for amounts.
Homestead exemption
For your primary residence. Reduces the value used to calculate your bill.
Senior / over-65
Many states add an exemption or freeze for owners 65 and older.
Disability
For homeowners with qualifying disabilities, often similar to the over-65 benefit.
Veterans
Disabled veterans may get partial or full exemptions depending on rating.
Frequently Asked Questions
What is the property tax rate in Contra Costa County, California?
How much are property taxes in Contra Costa County?
What is the deadline to appeal property taxes in Contra Costa County?
Is Contra Costa County a high property tax area?
Can TaxDrop help lower my Contra Costa County property taxes?
Property taxes in nearby counties
Alameda County
Rate: 0.76%
Median bill: $8,061
Solano County
Rate: 0.75%
Median bill: $4,408
San Joaquin County
Rate: 0.76%
Median bill: $3,782
San Mateo County
Rate: 0.61%
Median bill: $9,167
Marin County
Rate: 0.72%
Median bill: $10,001
Napa County
Rate: 0.70%
Median bill: $5,840
Sacramento County
Rate: 0.76%
Median bill: $3,768
Santa Clara County
Rate: 0.71%
Median bill: $9,766
TaxDrop One: $129 self-serve appeal packet
TaxDrop One is a $129 self-serve filing packet for Contra Costa County. You file the appeal; we prepare the evidence packet.
Check Your Savings