How hard is the water in Clearwater County, MN?
17.7 grains per gallon
A softener will pay its way here.
The median hardness measured in Clearwater County, MN is 304 mg/L as calcium carbonate, which is 17.7 gpg. That is very hard on the USGS scale. It comes from 18 samples at 14 sites between 1990 and 2025, 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 13.4 and 20.9 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 17.7 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 9.1 to 25.1 gpg
The softest single sample on record in Clearwater County was 155.5 mg/L and the hardest 430 mg/L, a 3-fold gap. The top quarter of sites read above 20.9 gpg and the bottom quarter below 13.4 gpg.
Wells 17.7 gpg, rivers and lakes 9.2 gpg
18 groundwater samples from 14 wells put the median at 303.8 mg/L. 94 surface samples from 39 sites put it at 157 mg/L. In Clearwater County the wells come out 8.5 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 388 lb of salt a year (10 bags of 40 lb, about $70), 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 $170 a year.
Sizing at 17.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,062 | 24,000 | 129 lb |
| 2 | 2,124 | 24,000 | 258 lb |
| 4 | 4,248 | 32,000 | 517 lb |
| 6 | 6,372 | 48,000 | 775 lb |
Clearwater County against the rest of Minnesota
Among the 87 Minnesota counties with data, Clearwater County is number 37 of 87 counting from the hardest. Across the whole country it is harder than 78% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Clearwater County: Norman County (17.7), Otter Tail County (17.6), Olmsted County (18).