How hard is the water in Yellow Medicine County, MN?
32.8 grains per gallon
A softener will pay its way here.
The median hardness measured in Yellow Medicine County, MN is 562 mg/L as calcium carbonate, which is 32.8 gpg. That is very hard on the USGS scale. It comes from 25 samples at 24 sites between 1991 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 23 and 36.6 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 32.8 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 18.3 to 70.1 gpg
The softest single sample on record in Yellow Medicine County was 313 mg/L and the hardest 1,200 mg/L, a 4-fold gap. The top quarter of sites read above 36.6 gpg and the bottom quarter below 23 gpg.
Wells 32.8 gpg, rivers and lakes 35.5 gpg
25 groundwater samples from 24 wells put the median at 562 mg/L. 87 surface samples from 13 sites put it at 608 mg/L. In Yellow Medicine County the rivers and lakes come out 2.7 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 48,000-grain unit covers a week between regenerations. Expect about 717 lb of salt a year (18 bags of 40 lb, about $129), 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 $229 a year.
Sizing at 32.8 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,968 | 24,000 | 239 lb |
| 2 | 3,936 | 32,000 | 479 lb |
| 4 | 7,872 | 64,000 | 958 lb |
| 6 | 11,808 | twin tank | 1,437 lb |
Yellow Medicine County against the rest of Minnesota
Among the 87 Minnesota counties with data, Yellow Medicine County is number 3 of 87 counting from the hardest. Across the whole country it is harder than 96% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Yellow Medicine County: Lyon County (32.1), Big Stone County (35.3), Lac qui Parle County (29.7).