Agreed with rcontrera. I know that locally, there are a few places that actually do the hydro test, and a vast majority of the scuba shops, paintball stores, and even fire departments, have their hydrotests done with them.
Easiest answer is either check with your local shops to see what they say, or to find a user on here,sartek
, as he has a list of places that actually do hydrotests in his signature. Of course, I have no idea if it has been updated regularly or not.