How hard is the water in Dodge County, MN?
16.2 grains per gallon
A softener will pay its way here.
The median hardness measured in Dodge County, MN is 277 mg/L as calcium carbonate, which is 16.2 gpg. That is very hard on the USGS scale. It comes from 6 samples at 4 sites between 1997 and 2024, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 14.8 and 17.6 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 16.2 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 14.5 to 17.8 gpg
The softest single sample on record in Dodge County was 248 mg/L and the hardest 305 mg/L, a 1-fold gap. The top quarter of sites read above 17.6 gpg and the bottom quarter below 14.8 gpg.
Wells 14.5 gpg, rivers and lakes 17.5 gpg
3 groundwater samples from 1 wells put the median at 248 mg/L. 3 surface samples from 3 sites put it at 299 mg/L. In Dodge County the rivers and lakes come out 3.0 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer 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 353 lb of salt a year (9 bags of 40 lb, about $64), 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 $164 a year.
Sizing at 16.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 972 | 24,000 | 118 lb |
| 2 | 1,944 | 24,000 | 237 lb |
| 4 | 3,888 | 32,000 | 473 lb |
| 6 | 5,832 | 48,000 | 710 lb |
Dodge County against the rest of Minnesota
Among the 87 Minnesota counties with data, Dodge County is number 50 of 87 counting from the hardest. Across the whole country it is harder than 73% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Dodge County: Dakota County (16.3), Wabasha County (16.4), Winona County (16.4).