Hardness levels are based on averages taken
from EPA water quality samples in your area.
How many Grains per Gallon (GPG) do you have?
| Under 3 GPG: | Low Hardness |
| 3-7 GPG: | Moderate Hardness |
| 7-10 GPG: | Hard Water |
| 10-14 GPG: | Very Hard Water |
| Over 14 GPG: | Extremely Hard Water |
GPG: Grains per Gallon is the industry standard unit of measure for the amount of hardness in a given water source.
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