<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Pixie Hamilton</dc:creator>
  <dc:date>2002</dc:date>
  <dc:description>&lt;p&gt;&lt;span class="EXLDetailsDisplayVal"&gt;In 1991, the National &lt;span class="searchword"&gt;Water&lt;/span&gt;-&lt;span class="searchword"&gt;Quality&lt;/span&gt; Assessment (NAWQA) Program of the U.S. Geological Survey (USGS) began evaluating the &lt;span class="searchword"&gt;quality&lt;/span&gt; of streams, ground &lt;span class="searchword"&gt;water&lt;/span&gt;, and aquatic ecosystems in 51 &lt;span class="searchword"&gt;major&lt;/span&gt; &lt;span class="searchword"&gt;river&lt;/span&gt; &lt;span class="searchword"&gt;basins&lt;/span&gt; and aquifer systems (known as "study units") across the nation. The assessments characterize the ambient &lt;span class="searchword"&gt;water&lt;/span&gt; resource - the source of about 60 percent of the &lt;span class="searchword"&gt;nation's&lt;/span&gt;drinking &lt;span class="searchword"&gt;water&lt;/span&gt;, as well as &lt;span class="searchword"&gt;water&lt;/span&gt; for industrial, irrigation, and recreational uses - and thereby complement much of the compliance and regulatory monitoring conducted at the state level and by the U.S. Environmental Protection Agency (USEPA).&lt;/span&gt; &lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:language>en</dc:language>
  <dc:publisher>American Water Resources Association</dc:publisher>
  <dc:title>Water-Quality patterns in some of the nation's major river basins and aquifers</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>