As an adult, the only risks for HIV are:
1) having unprotected, penetrative vaginal or anal sex, or
2) sharing IV drug needles with other IV drug users.
If you don't do either of the two activities I mentioned above, you will NEVER have to worry about HIV. HIV does not transfer from person-to-person via a third party - in this case, that third party is water. It is NEVER transmitted by blood that is outside of a living host (a person).
This scenario was ZERO risk to you and you do not need to test.