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Generally, yes. In the United States, the public tap water supply is monitored to make sure contaminants are kept to very low levels.
However, if your tap water comes from a private well, you're responsible for testing and treating it. (For more information on how to do this, visit the Centers for Disease Control's page on well water testing.)
Some studies have suggested that drinking tap water in certain areas during pregnancy was associated with adverse pregnancy outcomes. But none of these studies were able to prove that tap water caused pregnancy problems.
Of course, if you know there are contaminants in your drinking water that exceed the legal safety limits, you won't want to drink it, pregnant or not.
Unfortunately, bottled water is not any safer than tap water, since it's not as well regulated.
Find out how to tell if your water is safe and what to do if it isn't.
Mara Gaudette, M.S., CGC, contributed to this answer. She's a teratogen information specialist with MotherToBaby, a service of the nonprofit Organization of Teratology Information Specialists (OTIS).