Well water hardness in Utah
Across 24 counties of Utah, the median well sampled by the USGS has 15.4 gpg of hardness. Counties range from 6.5 gpg (San Juan County) to 28.6 gpg (Juab 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 | ||
|---|---|---|---|---|
| Juab County | 28.6 | 490 | 56 | very hard |
| Emery County | 25.7 | 440 | 23 | very hard |
| Salt Lake County | 20.2 | 346 | 243 | very hard |
| Sanpete County | 19.3 | 330 | 39 | very hard |
| Tooele County | 19.2 | 330 | 212 | very hard |
| Box Elder County | 19 | 325 | 61 | very hard |
| Sevier County | 18.6 | 319 | 52 | very hard |
| Kane County | 18 | 308 | 26 | very hard |
| Millard County | 17.5 | 300 | 141 | very hard |
| Beaver County | 16.7 | 286 | 53 | very hard |
| Utah County | 15.8 | 270 | 204 | very hard |
| Grand County | 15.5 | 265 | 40 | very hard |
| Uintah County | 15.3 | 262 | 45 | very hard |
| Iron County | 15.2 | 260 | 119 | very hard |
| Cache County | 15 | 257 | 41 | very hard |
| Summit County | 14.1 | 242 | 80 | very hard |
| Wasatch County | 13.9 | 239 | 52 | very hard |
| Davis County | 13.3 | 228 | 73 | very hard |
| Washington County | 13 | 223 | 80 | very hard |
| Garfield County | 12.1 | 207 | 32 | very hard |
| Duchesne County | 10.4 | 178 | 37 | hard |
| Piute County | 10.3 | 177 | 12 | hard |
| Weber County | 9.3 | 159 | 67 | hard |
| San Juan County | 6.5 | 111 | 139 | moderately hard |
Counties with fewer than 10 sampled wells, or a median outside 5–500 mg/L, are not shown until the figure is reviewed.
Utah: tap water hardness by city → · Well water hardness by state and county →