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Scientific Investigations Report 2007–5261

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5261

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Table 4. Summary of exceedances of drinking-water standards for chemical constituents with available analyses from more than 25 sampling sites, Basin and Range carbonate-rock aquifer system study area, Nevada and Utah.

[Drinking-water standards: All values are in milligrams per liter except for pH, which is in standard units. –, no standard]

Constituent Drinking-water standards   Number of sampling sites
Primary Secondary Constituent
detected
Exceeding
standard
Antimony 0.006 112 0
Arsenic 0.01 90 2
Barium 2 146 0
Beryllium 0.004 146 1
Cadmium 0.005 147 0
Chloride 250 179 6
Chromium 0.1 54 0
Copper 1 38 0
Fluoride 4 122 4
Iron 0.3 37 2
Manganese 0.05 48 2
pH 16.5-8.5 179 21
Selenium 0.05 35 0
Sulfate 250 177 4
Thallium 0.002 112 0
Zinc 5 147 1

1Acceptable range for pH.

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