Probably not as clean as you would expect. The Environmental Working Group has identified more than 300 chemicals in water systems nationwide, most of which aren't even regulated. Contaminants vary with each water system. Luckily, the EWG has created a user-friendly database, which allows you to search your city and view its detailed report. It also provides information on filter options based on the contaminants found. If you live in an old house and you're not at least using a BRITA filter (or its equivalent), it's time to get one-especially if you have children. Even small amounts of lead have been shown to effect IQ levels.
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