EWG found cancer-causing chromium-6 in tap water from 31 of 35 cities it tested. Americans deserve the protection of official safety standards to protect our water and health. Learn more.

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EWG Explains: How to choose the best water filters

Water filters are necessary to remove or reduce the myriad chemicals that contaminate our nation's drinking water, some of which are linked to cancer and endocrine disruption.

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