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 7.3-6A.  There are no impaired lakes or streams in this basin. Figure 7.3-8 shows the location of water quality occurrences keyed to Table 7.3-6.  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 7.3-6A.
• Eighty-two wells have parameter concentrations that have equaled or exceeded drinking water standards.
• The most frequently equaled or exceeded the parameter was fluoride. 
• Other parameters equaled or exceeded include arsenic, lead, chromium, total dissolved solids and nitrates.

Table 7.3-6 Water Quality Exceedences in the Harquahala Basin

Figure 7.3-8 Harquahala Basin Water Quality Conditions

Arizona Water Atlas Home

Lower Colorado River Planning Area Home

References and Supplemental Reading for the Harquahala Basin