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 6.5-4A.  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  6.5-4B.  Figure 6.5-8 shows the location of water quality occurrences keyed to Table 6.5-4.  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 6.5-4A.
• One spring has a parameter concentration that has equaled or exceeded the drinking water standard for arsenic.

Lakes and Streams with Impaired Waters

• Refer to Table 6.5-4B and Figure 6.5-8
• 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 also forms part of the border with the Coconino 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.