Water Quality Associtation Hardness Classification Table |
| Classification |
Hardness |
| Soft Water |
0 to 1 Grains per Gallon |
| Slightly Hard Water |
1 to 3 Grains per Gallon |
| Moderately Hard Water |
3 to 7 Grains per Gallon |
| Hard Water |
7 to 10 Grains per Gallon |
| Very Hard Water |
10 to 14 Grains per Gallon |
| Extremely Hard Water |
Over 14 Grains per Gallon |