Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 3.12-6A.  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 3.12-6B.  Figure 3.12-9 shows the location of exceedences and impairment keyed to Table 3.12-6.  A description of water quality data sources and methods is found in Volume 1, Appendix A.  Not all parameters were measured at all sites; selective sampling for particular constituents is common. 

Well, Mine or Spring sites that have equaled or exceeded drinking water standards (DWS)

• Refer to Table 3.12-6A.
• Six sites have parameter concentrations that have equaled or exceeded DWS. 
• Frequently equaled or exceeded parameters include arsenic and lead. 
• Other parameters commonly equaled or exceeded in the sites measured in this basin were radionuclides, cadmium and antimony.

Lakes and Streams with impaired waters

• Refer to Table 3.12-6B.
• Water quality standards for mercury were equaled or exceeded in Parker Canyon Lake.
• Parker Canyon Lake is part of the ADEQ water quality improvement effort called the Total Maximum Daily Load  (TMDL) program.  Sampling to create a TMDL report is ongoing.

Click to view Table 3.12-6 Water Quality Exceedences in the San Rafael Basin

Click to view Figure 3.12-9 San Rafael Basin Water Quality Conditions

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