I don't think there is a verdict.
Your tap water might be fine. It might not be. You need to check with your water authority and see what's in it. If it's loaded with fluoride and chlorine or chloramine you will want to consider using a filtered or distilled water.
Note that if your water has a lot of limestone (is "hard" water) that's not really a problem, the limestone is calcium carbonate which is what we use to supplement our chameleon's calcium intake, so don't worry at all about that.
Note also that you do not want to use "softened" water because the process puts too much sodium in the water.
You cannot go wrong using purified or distilled water, but you might not have to.