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Colorado Surface Water Standards -Rule 31 <br />METAL <br />Drinking Water Supply <br />arts per billion <br />Aluminum <br />87* <br />Antimony <br />6 <br />Arsenic <br />50 <br />Barium <br />490 <br />Beryllium <br />4 <br />Cadmium <br />5 <br />Chromium III(5) <br />50 <br />Chromium VI(5) <br />50 <br />Copper <br />1 <br />Iron <br />300 <br />Lead <br />50 <br />Manganese <br />50 <br />Mercury <br />2 <br />Nickel <br />100 <br />Selenium <br />50 <br />Silver <br />100 <br />Thallium <br />0.5 <br />Zinc <br />5000 <br />*chronic threshold for aquatic life <br />10 <br />