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 5.4-7A.  Impaired lakes and streams with site type, name, length of impaired reach, area of impaired lake, designated use standard and parameter(s) exceeded is shown in Table 5.4-7B.  Figure 5.4-9 shows the location of water quality occurrences keyed to Table 5.4-7. 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 5.4-7A.

• Forty-five sites have parameter concentrations that have equaled or exceeded drinking water standards.  The majority of the sites are in the vicinity of Wickenburg.

• The most commonly equaled or exceeded standard was arsenic.  Other standards equaled or exceeded include cadmium, lead, radionuclides, barium, beryllium, nitrate, copper and mercury. 

Lakes and Streams with impaired waters

• Refer to Table 5.4-7B.

• Water quality standards were exceeded in four stream reaches on three streams in the basin.

• All reaches exceeded standards for copper and zinc.  Other standards exceeded were cadmium and pH.

• The French Gulch and Hassayampa River impaired reaches are part of the ADEQ water quality improvement effort called the Total Maximum Daily Load (TMDL) program.  The final reports have been completed for these reaches.
• Impaired reaches on Cash Mine Creek are not part of the TMDL program at this time.

Click to view Table 5.4-7 Water Quality Exceedences in the Upper Hassayampa Basin

Click to view Figure 5.4-9 Upper Hassayampa Basin Water Quality Conditions

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References and Supplemental Reading for the Upper Hassyampa Basin