Water Hardness Maryland
Here are the water hardness values for the cities in Maryland.
| City | AVG Hardness PPM / mg/L | AVG Hardness Grains per Gallon |
|---|---|---|
| Frederick | 101 | 6 |
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| City | AVG Hardness PPM / mg/L | AVG Hardness Grains per Gallon |
|---|---|---|
| Frederick | 101 | 6 |