The result of your conversion between nanogram/milliliter and ounce/gallon [US] appears here
To convert between Nanogram/milliliter and Ounce/gallon [US] you have to do the following:
First divide 1.0E-12/0.000001 / (0.45359237/16)/0.0037854118 = 0.00000013
Then multiply the amount of Nanogram/milliliter you want to convert to Ounce/gallon [US], use the chart below to guide you.
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