How hard is the water in Roseau County, MN?
9.5 grains per gallon
A softener is worth it here.
The median hardness measured in Roseau County, MN is 162 mg/L as calcium carbonate, which is 9.5 gpg. That is hard on the USGS scale. It comes from 9 samples at 4 sites between 2023 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 8.7 and 11 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: medium (how it is measured).
What to do next
At 9.5 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Roseau 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 7.2 to 15.2 gpg
The softest single sample on record in Roseau County was 123 mg/L and the hardest 260 mg/L, a 2-fold gap. The top quarter of sites read above 11 gpg and the bottom quarter below 8.7 gpg.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 206 lb of salt a year (6 bags of 40 lb, about $37), 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 $137 a year.
Sizing at 9.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 570 | 24,000 | 69 lb |
| 2 | 1,140 | 24,000 | 139 lb |
| 4 | 2,280 | 24,000 | 277 lb |
| 6 | 3,420 | 24,000 | 416 lb |
Roseau County against the rest of Minnesota
Among the 87 Minnesota counties with data, Roseau County is number 77 of 87 counting from the hardest. Across the whole country it is harder than 49% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Roseau County: Waseca County (9.9), Chisago County (8.4), Morrison County (10.5).