How hard is the water in Le Sueur County, MN?
12.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Le Sueur County, MN is 211 mg/L as calcium carbonate, which is 12.3 gpg. That is very hard on the USGS scale. It comes from 129 samples at 30 sites between 1991 and 2025, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 9.7 and 20.1 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: high (how it is measured).
What to do next
At 12.3 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. Because Le Sueur County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 8.6 to 26.0 gpg
The softest single sample on record in Le Sueur County was 147 mg/L and the hardest 445 mg/L, a 3-fold gap. The top quarter of sites read above 20.1 gpg and the bottom quarter below 9.7 gpg.
Wells 19.3 gpg, rivers and lakes 11.7 gpg
10 groundwater samples from 3 wells put the median at 330.5 mg/L. 119 surface samples from 27 sites put it at 200 mg/L. In Le Sueur County the wells come out 7.6 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 269 lb of salt a year (7 bags of 40 lb, about $48), 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 $148 a year.
Sizing at 12.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 738 | 24,000 | 90 lb |
| 2 | 1,476 | 24,000 | 180 lb |
| 4 | 2,952 | 24,000 | 359 lb |
| 6 | 4,428 | 32,000 | 539 lb |
Le Sueur County against the rest of Minnesota
Among the 87 Minnesota counties with data, Le Sueur County is number 69 of 87 counting from the hardest. Across the whole country it is harder than 60% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Le Sueur County: Martin County (12.4), Itasca County (11.7), Cass County (13).