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 6.6-7A. 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 6.6-7B. Figure 6.6-10 shows the location of water quality occurrences keyed to Table 6.6-7. 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 6.6-7A.
Thirteen wells have parameter concentrations that have equaled or exceeded drinking water standards.
The most common standard equaled or exceeded was arsenic. Other standards equaled or exceeded were radionuclides, nitrates and lead.
Lakes and Streams with Impaired Reaches
- Refer to Table 6.6-7B and Figure 6.6-10.
- Water quality standards for suspended sediment concentration and selenium were exceeded in one 10-mile stream reach, the Virgin River from Beaver Dam Wash to Big Bend Wash.
- This reach is not part of the ADEQ water quality improvement effort called the Total Maximum Daily Load (TMDL) Program at this time.
Click for Table 6.6-7 Water Quality Exceedences in the
Virgin River Basin
Click for Figure 6.6-10 Virgin River Basin
Water Quality Conditions