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The Water Information Center - An online resource for public water system basics and water management issues from the National Academy of Sciences.

US Environmental Protection Agency Drinking water page

US. Centers for Disease Control and Prevention (CDC) Healthy Water - Public Water Systems - One-stop resource for information on public water systems supplying tap water including information on drinking water, fluoridation, water testing, water-related diseases and contaminants, etc., plus links to EPA, WHO, and other resources.