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

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 7.11-6A.  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  7.11-6B.  Figure 7.11-10 shows the location of water quality occurrences keyed to Table 7.11-6 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 7.11-6A
  • One hundred and three wells have parameter concentrations that have equaled or exceeded drinking water standards.
  • Parameters frequently equaled or exceeded include arsenic, organics, lead and total dissolved solids.   Other parameters equaled or exceeded include antimony, beryllium, cadmium thallium, and nitrate.

Lakes and Streams with impaired waters

  • Refer to Table 7.11-6B
  • The water quality standard for boron and selenium was equaled or exceeded in one 28 mile reach of the Gila River; a portion of this reach is also in the Lower Gila Basin.
  • This reach of the Gila River is not part of the ADEQ water quality improvement effort, the Total Maximum Daily Load (TMDL) Program, at this time. 

Click here for Table 7.11-6

Table 7.11-6 Water Quality Exceedences in the Yuma Basin

Click here for Figure 7.11-10

Figure 7.11-10 Yuma Basin Water Quality Conditions

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