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Securing Arizona's Water Future

Water Quality in the Coconino Plateau 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 6.1-7A.  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  6.1-7B.  Figure 6.1-10 shows the location of water quality occurrences keyed to Table 6.1-7.  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 6.1-7A.
  • Twenty-two wells or springs 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 include total dissolved solids, radionuclides, thallium, nitrates, mercury and lead.

Lakes and Streams with Impaired Streams

  • Refer to Table Table 6.1-7B and Figure 6.1-10
  • The water quality standard for suspended sediment concentration was exceeded in one 28-mile stream reach, the Colorado River from Parashant Canyon to Diamond Creek. This impaired reach is located along part of the border with the Shivwits Plateau Basin.

    This reach is not part of the ADEQ water quality improvement effort called the Total Maximum Daily Load (TMDL) Program at this time. 

Effluent Dependent Reaches

  • Refer to Figure 6.1-10
  • There is one effluent dependent reach in this basin, which receives effluent from the South Rim Wastewater Treatment Plant.

Click to view Table 6.1-7

Click for Table 6.1-7 Water Quality Exceedences in the

Coconino Plateau Basin

Click to view Figure 6.1-10

Click for Figure 6.1-10 Coconino Plateau Basin

Water Quality Conditions

 

 

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