Norman, Oklahoma

====Drinking water quality====
In 2010, drinking water in Normal was identified as levels of [[hexavalent chromium]] 3 and 6 near the higher end of the acceptable [[United States Environmental Protection Agency|EPA]] limit.<ref name="OK_chrom">{{cite web |url=http://normantranscript.com/headlines/x96560292/In-35-city-study-Norman-s-water-tops-results-chart |publisher=Norman Transcript |title=In 35-city study, Norman's water tops results chart |access-date=December 21, 2010 |url-status=dead |archive-url=https://archive.today/20130130021950/http://normantranscript.com/headlines/x96560292/In-35-city-study-Norman-s-water-tops-results-chart |archive-date=January 30, 2013 |df=mdy-all}}</ref> The Garber-Wellington [[Aquifer]], which is known to have elevated levels of [[heavy metals]], was identified as a possible source.<ref name="OK_chrom" /> Norman's water supply has also been noted for excessive levels of [[arsenic]].<ref>{{cite web |url=http://pubs.usgs.gov/fs/2005/3111/ |publisher=United States Geological Survey |title=Naturally Occurring Arsenic in Ground Water |access-date=February 2, 2011}}</ref> The city responded by building new wells and removing old ones.<ref>{{cite web |url=http://www.ci.norman.ok.us/content/water-treatment-arsenic-study |publisher=City of Norman |title=Water Treatment Arsenic Study |access-date=February 2, 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110104031940/http://www.ci.norman.ok.us/content/water-treatment-arsenic-study |archive-date=January 4, 2011 |df=mdy-all}}</ref>