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Element
Upper-limit Guideline (mg/L or ppm)
Aluminum
0.5
Arsenic
0.05
Boron
5.0
Cadmium
0.005
Chromium
0.1
Cobalt
1.0
Copper
Fluorine
2.0
Lead
0.015
Manganese
Mercury
0.01
Nickel
0.25
Selenium
Vanadium
Zinc
Reprinted with permission from the National Academies Press, copyright 2001, National Academy of Sciences.