Well water hardness in Indiana
Across 19 counties of Indiana, the median well sampled by the USGS has 17.5 gpg of hardness. Counties range from 9.7 gpg (Newton County) to 23.7 gpg (Marion 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 | ||
|---|---|---|---|---|
| Marion County | 23.7 | 406 | 53 | very hard |
| Wayne County | 21.9 | 376 | 16 | very hard |
| Bartholomew County | 20.9 | 358 | 10 | very hard |
| LaGrange County | 20.9 | 357 | 10 | very hard |
| Tippecanoe County | 20.4 | 350 | 34 | very hard |
| Noble County | 19.9 | 340 | 17 | very hard |
| Hancock County | 18.5 | 318 | 40 | very hard |
| Kosciusko County | 18.1 | 310 | 34 | very hard |
| Howard County | 17.8 | 305 | 20 | very hard |
| Morgan County | 17.5 | 300 | 23 | very hard |
| Daviess County | 17.3 | 297 | 11 | very hard |
| Lake County | 16.8 | 288 | 100 | very hard |
| St. Joseph County | 16 | 274 | 32 | very hard |
| Knox County | 15.5 | 265 | 20 | very hard |
| Sullivan County | 15.2 | 260 | 20 | very hard |
| Porter County | 15 | 258 | 166 | very hard |
| LaPorte County | 13.7 | 235 | 12 | very hard |
| Jasper County | 13.7 | 234 | 27 | very hard |
| Newton County | 9.7 | 166 | 21 | hard |
Counties with fewer than 10 sampled wells, or a median outside 5–500 mg/L, are not shown until the figure is reviewed.
Indiana: tap water hardness by city → · Well water hardness by state and county →