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 7.10-5A.  There are no impaired lakes or streams in this basin. Figure 7.10-9 shows the location of water quality occurrences keyed to Table 7.10-5.  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 7.10-5A.
• Six wells have parameter concentrations that have equaled or exceeded drinking water standards.
• The parameter for fluoride was equaled or exceeded in all wells.  Other parameters equaled or exceeded include arsenic and lead.

Table 7.10-5 Water Quality Exceedences in the Western Mexican Drainage Basin

Figure 7.10-9 Western Mexican Drainage Basin Water Quality Conditions

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References and Supplemental Reading for the Western Mexican Drainage Basin