How hard is the water in Rice County, MN?
20.9 grains per gallon
A softener will pay its way here.
The median hardness measured in Rice County, MN is 358 mg/L as calcium carbonate, which is 20.9 gpg. That is very hard on the USGS scale. It comes from 9 samples at 7 sites between 1996 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 19.6 and 21.9 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 20.9 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 18.9 to 25.6 gpg
The softest single sample on record in Rice County was 324 mg/L and the hardest 438 mg/L, a 1-fold gap. The top quarter of sites read above 21.9 gpg and the bottom quarter below 19.6 gpg.
Wells 20.9 gpg, rivers and lakes 11.5 gpg
9 groundwater samples from 7 wells put the median at 358 mg/L. 85 surface samples from 22 sites put it at 196.3 mg/L. In Rice County the wells come out 9.4 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 32,000-grain unit covers a week between regenerations. Expect about 457 lb of salt a year (12 bags of 40 lb, about $82), 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 $182 a year.
Sizing at 20.9 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,254 | 24,000 | 153 lb |
| 2 | 2,508 | 24,000 | 305 lb |
| 4 | 5,016 | 40,000 | 610 lb |
| 6 | 7,524 | 64,000 | 915 lb |
Rice County against the rest of Minnesota
Among the 87 Minnesota counties with data, Rice County is number 23 of 87 counting from the hardest. Across the whole country it is harder than 86% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Rice County: Clay County (21), Swift County (21.1), Rock County (20.5).