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Securing Arizona's Water Future
Water Quality in the Morenci Basin

Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 3.9-7A.  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 3.9-7B.  Figure 3.9-10 shows the location of exceedences and impairment keyed to Table 3.9-7.  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.  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 3.9-7A.
  • Three sites have parameter concentrations that have equaled or exceeded DWS. 
  • Parameters equaled or exceeded include beryllium, cadmium, copper, fluoride, arsenic, lead and nitrates

Lakes and Streams with impaired waters

  • Refer to Table 3.9-7B.
  • Water quality standards were exceeded in one lake, Luna Lake, and one reach of the San Francisco River.
  • The parameters exceeded in Luna Lake included dissolved oxygen and pH levels.
  • The parameter exceeded in the San Francisco River was sediment.
  • Luna Lake has been evaluated under the ADEQ water quality improvement effort called the Total Maximum Daily Load  (TMDL) program.  The TMDL report for Luna Lake was accepted by the EPA in 2000 and implementation of the water quality improvement plan is underway.  There are no TMDL reports for the impaired reach of the San Francisco River.

Click to view Table 3.9-7

Click to view Table 3.9-7 Water Quality Exceedences in the Morenci Basin

Click to view Figure 3.9-10

Click to view Figure 3.9-10 Morenci Basin

Water Quality Conditions

 

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