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WikiPedia: Nước_máy http://www.priceofwater.com/municipal-summary.html http://www.cdc.gov/healthywater/drinking/public/in... http://www.epa.gov/ebtpages/watedrinkingwater.html http://www.fda.gov/fdac/features/2002/402_h2o.html http://www.gizmology.net/pipe.htm http://www.astm.org/ http://www.copper.org/ http://www.iccsafe.org/ http://water.nationalacademies.org/ http://www.ngwa.org/