Well water hardness in Tennessee
Across 18 counties of Tennessee, the median well sampled by the USGS has 7.7 gpg of hardness. Counties range from 0.5 gpg (Fayette County) to 17.7 gpg (Marshall County).
Millions of American households drink water from their own well. No utility tests that water and no water quality report covers it. These pages summarise the hardness the U.S. Geological Survey measured in wells county by county, so you know what to expect before you test your own well.
Counties, hardest first
| gpg | mg/L | wells | ||
|---|---|---|---|---|
| Marshall County | 17.7 | 302 | 24 | very hard |
| Williamson County | 16.3 | 279 | 21 | very hard |
| Anderson County | 15.2 | 261 | 12 | very hard |
| Maury County | 15.2 | 260 | 33 | very hard |
| Grainger County | 13.4 | 229 | 39 | very hard |
| Lauderdale County | 8.8 | 150 | 19 | hard |
| Bedford County | 8.5 | 146 | 11 | hard |
| Roane County | 8.1 | 139 | 39 | hard |
| Hickman County | 7.9 | 135 | 21 | hard |
| Hamilton County | 7.6 | 130 | 49 | hard |
| Wayne County | 7.1 | 121 | 15 | hard |
| Shelby County | 6.4 | 109 | 265 | moderately hard |
| Humphreys County | 5.1 | 88 | 13 | moderately hard |
| Coffee County | 3.2 | 55 | 222 | soft |
| Franklin County | 2.4 | 41 | 56 | soft |
| Madison County | 1.8 | 31 | 66 | soft |
| Gibson County | 1.1 | 19 | 10 | soft |
| Fayette County | 0.5 | 8 | 11 | soft |
Counties with fewer than 10 sampled wells, or a median outside 5–500 mg/L, are not shown until the figure is reviewed.
Tennessee: tap water hardness by city → · Well water hardness by state and county →