Water Hardness Oklahoma
Here are the water hardness values for the cities in Oklahoma.
| City | AVG Hardness PPM / mg/L | AVG Hardness Grains per Gallon |
|---|---|---|
| Norman | 150 | 8.8 |
| Stillwater | 122.5 | 7.2 |
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| City | AVG Hardness PPM / mg/L | AVG Hardness Grains per Gallon |
|---|---|---|
| Norman | 150 | 8.8 |
| Stillwater | 122.5 | 7.2 |