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 7.2-7A. 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 7.2-7B. Figure 7.2-9 shows the location of water quality occurrences keyed to Table 7.2-7. 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 7.2-7A.
- One hundred and twenty-two wells have parameter concentrations that have equaled or exceeded drinking water standards.
- Ninety-two percent of the wells measured equaled or exceeded the parameter for fluoride.
- Other parameters equaled or exceeded include arsenic, nitrate, mercury, selenium and total dissolved solids.
Lakes and Streams with impaired waters
- Refer to Table 7.2-7B.
- The water quality standard for organics was equaled or exceeded in three reaches of the Gila River totaling 41 miles. The standard for organics was also equaled or exceeded in 100 acres of the Painted Rock Reservoir.
- None of the reaches or the lake are part of the ADEQ water quality improvement effort, the Total Maximum Daily Load (TMDL) Program, at this time.
Effluent Dependent Reaches
- See Figure 7.2-9
- There is one effluent dependent reach north of Gila Bend. This reach receives effluent from the Gila Bend Wastewater Treatment Plant.
Table 7.2-7 Water Quality in the Gila Bend Basin
Figure 7.2-9 Gila Bend Basin Water Quality Conditions