How hard is the water in Wilkin County, MN?
25.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Wilkin County, MN is 438 mg/L as calcium carbonate, which is 25.6 gpg. That is very hard on the USGS scale. It comes from 143 samples at 13 sites between 1991 and 2023, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 14.6 and 74.2 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: high (how it is measured).
What to do next
At 25.6 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.
More on sizing a softener for your household.
From 13.4 to 140.2 gpg
The softest single sample on record in Wilkin County was 230 mg/L and the hardest 2,400 mg/L, a 10-fold gap. The top quarter of sites read above 74.2 gpg and the bottom quarter below 14.6 gpg.
Wells 24.7 gpg, rivers and lakes 27.3 gpg
1 groundwater samples from 1 wells put the median at 423 mg/L. 142 surface samples from 12 sites put it at 467.5 mg/L. In Wilkin County the rivers and lakes come out 2.6 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. 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 40,000-grain unit covers a week between regenerations. Expect about 559 lb of salt a year (14 bags of 40 lb, about $101), 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 $201 a year.
Sizing at 25.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,536 | 24,000 | 187 lb |
| 2 | 3,072 | 24,000 | 374 lb |
| 4 | 6,144 | 48,000 | 748 lb |
| 6 | 9,216 | 80,000 | 1,121 lb |
Wilkin County against the rest of Minnesota
Among the 87 Minnesota counties with data, Wilkin County is number 9 of 87 counting from the hardest. Across the whole country it is harder than 92% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Wilkin County: Brown County (25.1), Nicollet County (25.1), Chippewa County (26.3).