How hard is the water in Jackson County, MN?
19.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Jackson County, MN is 330 mg/L as calcium carbonate, which is 19.3 gpg. That is very hard on the USGS scale. It comes from 138 samples at 21 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 12.9 and 21.5 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 19.3 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 10.3 to 27.6 gpg
The softest single sample on record in Jackson County was 176 mg/L and the hardest 472.5 mg/L, a 3-fold gap. The top quarter of sites read above 21.5 gpg and the bottom quarter below 12.9 gpg.
Wells 18.2 gpg, rivers and lakes 19.5 gpg
3 groundwater samples from 3 wells put the median at 311 mg/L. 135 surface samples from 18 sites put it at 333 mg/L. In Jackson County the rivers and lakes come out 1.3 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 32,000-grain unit covers a week between regenerations. Expect about 421 lb of salt a year (11 bags of 40 lb, about $76), 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 $176 a year.
Sizing at 19.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,158 | 24,000 | 141 lb |
| 2 | 2,316 | 24,000 | 282 lb |
| 4 | 4,632 | 40,000 | 564 lb |
| 6 | 6,948 | 64,000 | 845 lb |
Jackson County against the rest of Minnesota
Among the 87 Minnesota counties with data, Jackson County is number 32 of 87 counting from the hardest. Across the whole country it is harder than 82% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Jackson County: Murray County (19.6), Scott County (19.7), Steele County (19.7).