Well water hardness in Connecticut
Across 6 counties of Connecticut, the median well sampled by the USGS has 4.7 gpg of hardness. Counties range from 2.2 gpg (New London County) to 6.2 gpg (New Haven 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 | ||
|---|---|---|---|---|
| New Haven County | 6.2 | 107 | 32 | moderately hard |
| Tolland County | 5.1 | 87 | 23 | moderately hard |
| Litchfield County | 4.7 | 81 | 82 | moderately hard |
| Hartford County | 4.6 | 79 | 134 | moderately hard |
| Fairfield County | 3 | 52 | 46 | soft |
| New London County | 2.2 | 39 | 37 | soft |
Counties with fewer than 10 sampled wells, or a median outside 5–500 mg/L, are not shown until the figure is reviewed.
Connecticut: tap water hardness by city → · Well water hardness by state and county →