Maximum Contaminant Level

The legal threshold limit on the amount of a hazardous substance
that is allowed in drinking water under the <a
href="http://www.epa.gov/safewater/sdwa/basicinformation.html"&gt; Safe
Drinking Water Act</a>. The limit, set by the U.S. Environmental
Protection Agency, is usually expressed as a concentration in
milligrams or micrograms per liter of water.
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Information about MCLs is also available on the <a
href="http://www.health.state.mn.us/divs/eh/groundwater/mclbasedhrls.html"&gt;
Minnesota Department of Health</a> Web site.