Tap water hardness in Montana
We have published hardness data for 4 cities in Montana. The median is 8 gpg; the hardest water is in Missoula (9.5 gpg), the softest in Billings (6.5 gpg).
75 % of these cities have hard or very hard water (over 120 mg/L).
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Cities in Montana, hardest first
| gpg | mg/L | ||
|---|---|---|---|
| Missoula | 9.5 | 163 | hard |
| Great Falls | 8.5 | 145 | hard |
| Bozeman | 7.6 | 130 | hard |
| Billings | 6.5 | 112 | moderately hard |
On a private well? Well water hardness in Montana by county →