What are the health risks of using public swimming pools, if any?

Minimal: In a properly maintained public bathing facility, the biggest health risk is athletes foot from the locker room. However, if someone in the pool has bad diarrhea, for example, it is possible to get a nasty e. Coli infection from drinking the water. Similarly, if you are immunocompromised, it's possible to get things like legionarres disease from the moist air. But generally it's really safe.

Sun, chlorine: You are more likely to be adversely affected by a bad sunburn or chemical irritation from he high chlorine content in public swimming pools than from a contagious bug. Chlorine is exceptionally good at killing bacteria and viruses, and transmission is very unlikely. Hot tubs, if improperly cleaned, can harbor bacteria. The same is true for kiddie pools - lower water volume and chlorine content.