Wells, springs and mine sites with parameter concentrations that have equaled or exceeded drinking water standard(s), including location and parameter(s) are shown in Table 7.8-6A.  There are no impaired lakes or streams in this basin. Figure 7.8-7 shows the location of water quality occurrences keyed to Table 7.8-6.  A description of water quality data sources and methods is found in Volume 1, Appendix A.  Not all parameters were measured at all sites; selective sampling for particular constituents is common.

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

• Refer to Table 7.8-6A.
• Fifty-three wells have parameter concentrations that have equaled or exceeded drinking water standards.
• The parameter for arsenic was equaled or exceeded in eighty-one percent of the wells. 
• Other parameters equaled or exceeded include chromium, fluoride, mercury, lead, nitrate and total dissolved solids.

Table 7.8-6 Water Quality Exceedences in the San Simon Wash Basin

Figure 7.8-7 San Simon Basin Water Quality Conditions

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