Sites with parameter concentrations that have equaled or exceeded drinking water standard(s) (DWS), including location and parameter(s) are shown in Table 8.5-8A. 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 8.5-8B. Figure 8.5-10 shows the location of water quality occurrences keyed to Table 8.5-8. Figure 8.5-11 shows the located of contamination sites in the Tucson AMA. A description of water quality data sources and methods is found in Volume 1, Appendix A. 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.
Well, spring and mine sites that have equaled or exceeded drinking water standards (DWS)
- Refer to Table 8.5-8A.
- Three hundred and fifty-six sites have parameter concentrations that have equaled or exceeded DWS.
- Parameters equaled or exceeded include arsenic, lead, nitrates, fluoride, beryllium, cadmium, organics, mercury, copper, chromium, zinc, total dissolved solids, radionuclides, selenium and nitrates.
Lakes and Streams with impaired waters
- Refer to Table 8.5-8B.
- Water quality standards were equaled or exceeded in three lakes.
- Arivaca and Rose Canyon Lakes are part of the ADEQ water quality improvement effort called the Total Maximum Daily Load (TMDL) Program. The final TMDL document has been completed for both.
Effluent Dependent Reaches
- Refer to Figure 8.5-10
- A portion of the Santa Cruz River in this AMA is effluent dependent.
Contamination Sites
- Refer to Figure 8.5-11 and Table 8.5-9
- There are 15 Voluntary Remediation Program sites, seven Water Quality Assurance Revolving Fund sites, one active National Priority List site, one Department of Defense site and two Resource Conservation and Remediation Sites.
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Table 8.5-8 Water Quality Exceedences in the Tucson AMA
Figure 8.5-10 Tucson AMA Water Quality Conditions
Table 8.5-9 Contamination Sites in the Tucson AMA
Figure 8.5-11 Tucson AMA Contamination Sites |
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