Sexually Transmitted Infections (STI)

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

Alerts l Data l Cases and Rates l Fact Sheets

Health Care Providers Alerts

2022 Washington State STI Data*

  Chlamydia †** Gonorrhea ‡ Primary and Secondary
Syphilis ‡
Syphilis ‡
Overall Rate*: 365.0 per 100,000
# of cases: 28,708
# of cases in 2021: 30,352
Rate*: 144.9 per 100,000
# of cases: 11,392
# of cases in 2021: 11,098
Rate*: 24.4 per 100,000
# of cases: 1,915
# of cases in 2021: 1,488
# of cases: 52
# of cases in 2021: 53
Males Rate*: 276.5 per 100,000
# of cases: 10,896
# of cases in 2021: 11,211
Rate*: 186.9 per 100,000
# of cases: 7,367
# of cases in 2021: 6,987
Rate*: 34.9 per 100,000
# of cases: 1,374
# of cases in 2021: 1,143
Females Rate*: 450.2 per 100,000
# of cases: 17,665
# of cases in 2021: 19,066
Rate*: 100.7 per 100,000
# of cases: 3,949
# of cases in 2021: 4,044
Rate*: 13.6 per 100,000
# of cases: 534
# of cases in 2021: 337

*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 the most recently available population estimates; therefore, please interpret them with caution.

**Note: Chlamydia & Gonorrhea case counts for 2022 include cases which were reported through electronic lab reporting (ELR) only.

† Data source: PHIMS-STD April 2023, WELRS

‡ Data source: PHIMS-STD April 2023. Note: Gonorrhea case counts have been updated from previously reported numbers to reflect changes in case coding.

Disclaimer: Case counts reflect reported cases only.

STI Cases and rates by county, Washington State

Sexually Transmitted Infection Cases and Rates by County, 2022 (PDF)

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)

CDC Sexually Transmitted Disease Surveillance 2018 (PDF)

STI Data Dashboards

Check out our new STI data dashboards here: Sexually Transmitted Infections (STIs) Data | Washington State Department of Health.

These dashboards contain case counts and rates for chlamydia, gonorrhea, and syphilis in Washington for 2019-2022. This information can be filtered at the regional and local health jurisdiction level to show metrics based on race, sex, and year of diagnosis.

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.

Washington State STI Epidemiological Profile

Washington State STI Epidemiological Profile, 2023 (PDF)
This Epidemiological Profile presents a detailed overview of recent STI trends in Washington State shown through surveillance data. This profile focuses particularly on the population demographics of people diagnosed with STIs and statewide STI case outcomes.

STI Fact Sheets

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

DOH Office of Infectious Disease Syndemic Reports

HIV/AIDS & Family Planning