I did it a few years ago and was also grossed out by the water in the Potomac before the event. During and after, it really didn't matter. Go for it!

I've done several sprints and want to try an Olympic distance this summer. Love the idea of a great tri right in DC, but dry heave every time I think about swimming in the Potomac! If you've done it, how was the swim? (I'm okay with the distance; I literally am asking about water quality.) I understand there are misting tents at the swim exit. If I don't care about my time, can I hang out in one for a couple of minutes? (No joke!)