How hard is the water in Glacier County, MT?
13.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Glacier County, MT is 233 mg/L as calcium carbonate, which is 13.6 gpg. That is very hard on the USGS scale. It comes from 29 samples at 29 sites between 1990 and 2026, drawn from groundwater wells, which is what most taps and private wells in the county draw on.
How much it varies here
Half the sites came in between 9.2 and 17.5 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: medium (how it is measured).
What to do next
At 13.6 gpg a softener pays its way here. Before you buy, check the quoted unit's grain capacity against the sizing table below, and ask whether it regenerates on demand, which uses less salt than a timer. Call your utility for its own report if you are on city water. Because Glacier County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 0.8 to 66.6 gpg
The softest single sample on record in Glacier County was 13.3 mg/L and the hardest 1,140 mg/L, an 86-fold gap. The top quarter of sites read above 17.5 gpg and the bottom quarter below 9.2 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 13.6 gpg, rivers and lakes 10.8 gpg
29 groundwater samples from 29 wells put the median at 233 mg/L. 1,093 surface samples from 187 sites put it at 185 mg/L. In Glacier County the wells come out 2.8 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 297 lb of salt a year (8 bags of 40 lb, about $54), and roughly 2,346 gallons of regeneration water. Installed, most units run $1,000 to $4,500; spread over 15 years with salt, that is about $154 a year.
Sizing at 13.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 816 | 24,000 | 99 lb |
| 2 | 1,632 | 24,000 | 199 lb |
| 4 | 3,264 | 24,000 | 397 lb |
| 6 | 4,896 | 40,000 | 596 lb |
Glacier County against the rest of Montana
Among the 56 Montana counties with data, Glacier County is number 34 of 56 counting from the hardest. Across the whole country it is harder than 65% of counties.
Softest in Montana: Lincoln County at 3.4 gpg. Hardest: Rosebud County at 138.9 gpg. Closest to Glacier County: Pondera County (13.6), Broadwater County (13.6), Meagher County (13.9).