The simple answer is yes. There is no water source in the US today that is completely contaminant free. A more accurate question to ask yourself is, "Does my water contain harmful contaminants?" This is a very difficult question to answer because of the following reasons.

while there can be potentially thousands of contaminants found in drinking water, the Safe Drinking Water Act requires that water treatment facilities conduct tests on only a few over 100 possible contaminants.

there are many contaminants that have unknown effects upon our health, thus they are not listed as "harmful", even though they may be harmful.

even with fairly lax water quality regulations, it's estimated that one in five municipal water treatment facilities did not meet the safe drinking water standards for microbial contamination.

Public water utilities do their best to purify and deliver water to you. So the answer to the question "Does my water contain harmful contaminants?", is that it's very difficult, if not impossible to know whether your water contains harmful contaminants at any given time.