Hello and welcome to FF ! Tap water is safe in very few localities, since most cities treat it with chloramines which will hurt your frog. Gone are the days of letting tap water "air out" for couple days to get rid of chlorine ; chloramines are stable and will not gas out.

Today's better dechlorinators will also neutralize heavy metals and other bad stuff. Myself recommend Seachem's Prime or ExoTerra's Aquatize. For more info on the subject you can read this thread: http://www.frogforum.net/vivarium-te...hing-else.html.