Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 3.5-6A.  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 3.5-6B.  Figure 3.5-9 shows the location of exceedences and impairment keyed to Table 3.5-7.  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 3.5-6A.
• Forty-nine sites have parameter concentrations that have equaled or exceeded DWS. 
• Frequently equaled or exceeded parameters include fluoride, arsenic and nitrate. 

Lakes and Streams with impaired waters

• Refer to Table 3.5-6B.
• Water quality standards were exceeded in three reaches of Mule Gulch and one reach of Brewery Gulch.
• The parameter exceeded in every reach was copper.  Other parameters exceeded included cadmium, zinc and pH levels.
• All impaired stream reaches in this basin are part of the ADEQ water quality improvement effort called the Total Maximum Daily Load  (TMDL) program.  In all four stream reaches modeling has been completed, but additional sampling is needed to create the final TMDL report.

Effluent Dependent Reaches

• See Figure 3.5-9
• In 2005 Mule Gulch, in the vicinity of Bisbee was an effluent dependent reach.  Currently effluent is treated at the San Jose WWTP and discharged to Greenbrush Draw.