References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
No. You cannot get an STI from swimming pool or hot tub water. STI-causing bacteria and viruses cannot survive in chlorinated, treated water. They die within seconds to minutes outside the human body, and pool chemicals destroy them even faster.
This is a common worry, especially after using shared facilities, but the science is clear: pool water is not an STI transmission route.
Why STIs Can’t Spread in Water
- Chlorine kills them: Standard pool chlorination (1-3 ppm) destroys HIV, chlamydia, gonorrhoea, and herpes within seconds
- Dilution: Even in the unlikely event of infected fluids entering the water, the dilution factor is enormous
- Fragile organisms: Most STI pathogens can’t survive outside the warm, moist conditions of human mucous membranes
- No documented cases: There has never been a documented case of STI transmission through pool or hot tub water
What You Can Catch from Water (Not STIs)
While STIs aren’t a risk, some other infections can be associated with swimming pools and hot tubs:
- Folliculitis (“hot tub rash”): Caused by Pseudomonas bacteria in poorly maintained hot tubs. Causes itchy red bumps on skin that was submerged. Not an STI.
- Swimmer’s ear: Bacterial ear infection from contaminated water
- Cryptosporidium/Giardia: Parasitic infections from swallowing contaminated water (diarrhoeal illness, not an STI)
- Molluscum contagiosum: Theoretically possible through shared pool equipment (towels, kickboards), but not through the water itself
Frequently Asked Questions
Can you get herpes from a hot tub?
Not from the water. Herpes requires direct skin-to-skin contact. If you had sexual contact with someone in the hot tub, that’s a risk. The water itself is not.
Can you get chlamydia from a swimming pool?
No. Chlamydia trachomatis dies almost instantly outside the body and cannot survive in chlorinated water. Pool water has never been documented as a chlamydia transmission route.
Are public hot tubs dirty?
Poorly maintained hot tubs can harbour Pseudomonas and other bacteria that cause skin rashes. These aren’t STIs. Well-maintained, properly chlorinated facilities are safe. If a hot tub smells strongly of chlorine, looks cloudy, or has a slippery rim, avoid it.
Related reading
- Can You Catch an STI From a Toilet Seat?
- Can You Get Chlamydia From Kissing?
- Can You Get Herpes From a Toilet Seat?
- Can You Get Herpes From Kissing?
- Can You Get an STI if You're Both Virgins?
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
