Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 4.3-6A.  There are no impaired lakes or streams in this basin.  Figure 4.3-9 shows the location of exceedences keyed to Table 4.3-6.  Not all parameters were measured at all sites; selective sampling for particular constituents is common.  A description of water quality data sources and methods is found in Volume 1, Appendix A. 

Well, Mine or Spring sites that have equaled or exceeded drinking water standards (DWS)

• Refer to Table 4.3-6A.
• Twenty-three sites have parameter concentrations that have equaled or exceeded DWS. 
• The most frequently equaled or exceeded parameters was arsenic. 
• Other parameters equaled or exceeded in the sites measured in this basin were radionuclides, nitrates, lead and total dissolved solids.

Click to view Table 4.3-6 Water Quality Exceedences in

the Detrital Valley Basin