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On the basis of the NAWQA findings, approximately 15% of shallow groundwater sampled beneath agricultural and urban areas had nitrate levels above the MCL. Users can select from $70 million of chemical, biological and physical water quality data collected over the past 10 years in approximately 50 basins under the USGS NAWQA program and map it to show water quality conditions in a given area. Figure 2 and Table 4 illustrate the distribution of domestic household wells with Mn concentration > 300 [micro]g/L obtained by the USGS NAWQA program. |
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