What is the equivalent of one grain per gallon in mg/L?

One grain per gallon is a measure commonly used to express concentrations in water. To convert grains per gallon to milligrams per liter (mg/L), it's important to understand the relationship between these units.

One grain is equivalent to approximately 64.8 milligrams. Since there are about 3.78541 liters in a gallon, the conversion from grains per gallon to mg/L can be calculated as follows:

1 grain/gallon = 64.8 mg/3.78541 L, which simplifies to approximately 17.1 mg/L.

This conversion factor is crucial for water operators to understand when assessing water quality, as it helps them interpret measurements across different standards and regulatory frameworks. Thus, the equivalent of one grain per gallon is accurately expressed as 17.1 mg/L, making this the correct answer.