Located on the San Francisco Bay, San Mateo would be expected to have high STD rates. In fact, San Mateo County has a 2017 prevalence rate of 229 per 100K people. These rates are close to those of Orange County, but much lower than those of either Los Angeles or San Francisco County.
Health officials are concerned that there are surely more people out there who do not yet know that they are infected, and they urge all sexually active people to get tested.
In 2017, San Mateo County had 2,872 chlamydia cases, at a rate of 371.6 per 100K people, and this is much lower than California’s rate of 552.2. The gonorrhea and (primary and secondary) syphilis rates were 105.7 and 8.
If California is known for high STD rates, it should also be given credit for its efforts to fight STDs, such as sex education in schools and billboards that urge people to get tested. Many California organizations even offer free STD testing during campaigns.
There are some STD-testing clinics in San Mateo, and even more in the surrounding areas. Planned Parenthood, located on Baywood Ave, tests for STIs and treats all of them except HIV. The fee is on a sliding scale based on your income. The San Mateo Medical Center provides comprehensive STI testing. They also have an HIV-testing van for testing-on-demand services.