Sexually Transmitted Disease (STD)

Sexually Transmitted Diseases (STD) are the most commonly reported diseases in Washington State. Many are curable, others are treatable, all are preventable. Most people with STDs don't have obvious symptoms, but without treatment they can spread disease and possibly develop serious complications. Our STD program staff can help answer questions.

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Health Care Providers Alerts

2021 Preliminary Washington State STI Data*

  Chlamydia†** Gonorrhea‡  Primary and Secondary 



Overall   Rate*: 390.8 per 100,000
# of cases: 30,352
# of cases in 2020: 31,423
Rate*: 142.9 per 100,000
# of cases: 11,098
# of cases in 2020: 11,580
Rate*: 19.2 per 100,000
# of cases: 1,488
# of cases in 2020: 837
# of cases: 53
# of cases in 2020: 10 
Males Rate*: 289.3 per 100,000
# of cases: 11,211
# of cases in 2020: 11,578
Rate*: 180.3 per 100,000
# of cases: 6,987
# of cases in 2020: 7,111
Rate*: 29.5 per 100,000
# of cases: 1,143
# of cases in 2020: 670

Rate*: 490.0 per 100,000

# of cases: 19,066
# of cases in 2020: 19,718

Rate*: 103.9 per 100,000
# of cases: 4,044
# of cases in 2020: 4,436
Rate*: 8.7 per 100,000
# of cases: 337
# of cases in 2020: 162

*Note: Washington State STI data may differ from CDC STI data as additional information is gathered over time. All rate calculations presented here are preliminary and calculated using 2021 population estimates; therefore, please interpret them with caution. These rates will be revised if and when more detailed 2021 population data from the Census Bureau is released.

**Note: Chlamydia case counts for 2021 include cases which were reported through electronic lab reporting (ELR) only.

† Data source: PHIMS-STD 3/31/2022, WELRS

‡ Data source: PHIMS-STD 3/31/2022. Note: Congenital syphilis case counts have been updated to reflect additional case reports received through 11/01/2022. Gonorrhea case counts have been updated from previously reported numbers to reflect changes in case coding.

Disclaimer: Case counts reflect reported cases only. Due to the COVID-19 pandemic’s impact on access to medical care and reductions in routine screenings in 2020 and 2021, it is currently unclear whether reported decreases in 2021 and 2020 are true decreases.  

STI Cases and rates by county, Washington State

Sexually Transmitted Infection Cases and Rates by County, 2021 (PDF)

Sexually Transmitted Infection Cases and Rates by County, 2020 (PDF)

Sexually Transmitted Infection Cases and Rates by County, 2019 (PDF)

Sexually Transmitted Infection Cases and Rates by County, 2018 (PDF)

Sexually Transmitted Infection Cases and Rates by County, 2017 (PDF)

Sexually Transmitted Infection Cases and Rates by County, 2016 (PDF)

CDC Sexually Transmitted Disease Surveillance 2018 (PDF)

Get Tested, Get Treated!

Anyone under the age of 25 and is sexually active should get tested annually. At any age, if you think you may have been exposed to a sexually transmitted disease, you and your sex partner(s) should visit a health clinic, hospital or doctor for testing and treatment.

For more information and answers to common questions about Sexually Transmitted Disease, go to Frequently Asked Questions.

To find a location for testing, go to Getting Tested.

STD Fact Sheets

Centers for Disease Control and Prevention (CDC) offers fact sheet web pages in English and Spanish with information on different sexually transmitted diseases. Use the links below to go to the fact sheets.

DOH Office of Infectious Disease Syndemic Reports

HIV/AIDS & Family Planning