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Securing Arizona's Water Future
Water Quality in the Lake Mohave Basin

Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 4.6-7A.  Impaired lakes and streams with site type, name, length of impaired stream reach, area of impaired lake, designated use standard and parameter(s) exceeded is shown in Table 4.6-7B.  Figure 4.6-9 shows the location of exceedences and impairment keyed to Table 4.6-7.  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. 

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

  • Refer to Table 4.6-7A.
  • Sixty-five measured sites have parameter concentrations that have equaled or exceeded drinking water standards.
  • The parameter most frequently equaled or exceeded in the sites measured was arsenic.  Other parameters equaled or exceeded included cadmium, fluoride, lead, nitrate/nitrite, mercury and total dissolved solids.

Lakes and Streams with impaired waters

  • Refer to Table 4.6-7B.
  • Water quality standards for selenium were equaled or exceeded in one 40-mile reach of the Colorado River between Hoover Dam and Lake Mohave.
  • The Colorado River between Hoover Dam and Lake Mohave is not part of the ADEQ water quality improvement effort called the Total Maximum Daily Load (TMDL) program at this time.

Click to view Table 4.6-7

Click to view Table 4.6-7 Water Quality Exceedences in the Lake Mohave Basin

Click to view Figure 4.6-9

Click for Figure 4.6-9 Lake Mohave Basin

Water Quality Conditions

 

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