Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 3.14-7A.  There are no data on impaired lakes and streams in this basin.  Figure 3.14-9 shows the location of exceedences keyed to Table 3.14-7A.  All community water systems are regulated under the Safe Drinking Water Act and treat water supplies to meet drinking water standards.  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.   Information on contamination sites in the basin is in Section 3.0.6 Water Supply - Contamination Sites.

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

• Refer to Table 3.14-7A.

• Seventy-three sites have parameter concentrations that have equaled or exceeded DWS. 

• Frequently equaled or exceeded parameters include arsenic and fluoride.

• Other parameters equaled or exceeded in the sites measured in this basin were  radionuclides, nitrates, lead, beryllium, antimony and total dissolved solids.

Click to view Table 3.14-7 Water Quality Exceedences in the Willcox Basin

Click to view Figure 3.14-9 Willcox Basin

Water Quality Conditions

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