How hard is the water in Richland County, MT?
29.1 grains per gallon
A softener will pay its way here.
The median hardness measured in Richland County, MT is 498 mg/L as calcium carbonate, which is 29.1 gpg. That is very hard on the USGS scale. It comes from 18 samples at 14 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 20.8 and 31.9 gpg. The whole middle of that range gives the same answer, so a test of your own tap is unlikely to change it. Confidence in the county figure: medium (how it is measured).
What to do next
At 29.1 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.
More on sizing a softener for your household.
From 0.4 to 48.3 gpg
The softest single sample on record in Richland County was 7.2 mg/L and the hardest 827.5 mg/L, a 115-fold gap. The top quarter of sites read above 31.9 gpg and the bottom quarter below 20.8 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 29.1 gpg, rivers and lakes 32.7 gpg
18 groundwater samples from 14 wells put the median at 498 mg/L. 535 surface samples from 56 sites put it at 560.5 mg/L. In Richland County the rivers and lakes come out 3.6 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 40,000-grain unit covers a week between regenerations. Expect about 635 lb of salt a year (16 bags of 40 lb, about $114), 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 $214 a year.
Sizing at 29.1 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,746 | 24,000 | 212 lb |
| 2 | 3,492 | 32,000 | 425 lb |
| 4 | 6,984 | 64,000 | 850 lb |
| 6 | 10,476 | 80,000 | 1,275 lb |
Richland County against the rest of Montana
Among the 56 Montana counties with data, Richland County is number 14 of 56 counting from the hardest. Across the whole country it is harder than 94% of counties.
Softest in Montana: Lincoln County at 3.4 gpg. Hardest: Rosebud County at 138.9 gpg. Closest to Richland County: Fergus County (28.9), Dawson County (30.2), Yellowstone County (27.7).