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 |
|---|---|---|
| Annapolis | 70 | 4 |
| Baltimore | 185 | 11 |
| Frederick | 101 | 6 |
| Gaithersburg | 71 | 4 |
| City | AVG Hardness PPM / mg/L | AVG Hardness Grains per Gallon |
|---|---|---|
| Annapolis | 70 | 4 |
| Baltimore | 185 | 11 |
| Frederick | 101 | 6 |
| Gaithersburg | 71 | 4 |