Originally Posted by
rxgeek
I have been to Thailand many times and obsessed about drinking tap water. I even used bottled water to brush my teeth. Lately, I have been using the tap to rinse my mouth with no ill effect. Am I being too cautious or not enough?
Yes, you are being too cautious. Brushing teeth, etc is perfectly safe using tap water (ok, maybe if you go to a small village in Isaan and use a communal water hose, then not so much

). Just do not drink it, and you will be fine - been living here for eight years and frequently visiting for 20+ years before that, and never had any ill effects from water