How hard is the water in Carver County, MN?
16.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Carver County, MN is 285 mg/L as calcium carbonate, which is 16.6 gpg. That is very hard on the USGS scale. It comes from 96 samples at 15 sites between 1990 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 12.3 and 23 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 16.6 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 9.0 to 27.1 gpg
The softest single sample on record in Carver County was 154 mg/L and the hardest 464.5 mg/L, a 3-fold gap. The top quarter of sites read above 23 gpg and the bottom quarter below 12.3 gpg.
Wells 20.6 gpg, rivers and lakes 14.7 gpg
2 groundwater samples from 2 wells put the median at 352.5 mg/L. 94 surface samples from 13 sites put it at 251 mg/L. In Carver County the wells come out 5.9 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 364 lb of salt a year (10 bags of 40 lb, about $65), 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 $165 a year.
Sizing at 16.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 996 | 24,000 | 121 lb |
| 2 | 1,992 | 24,000 | 242 lb |
| 4 | 3,984 | 32,000 | 485 lb |
| 6 | 5,976 | 48,000 | 727 lb |
Carver County against the rest of Minnesota
Among the 87 Minnesota counties with data, Carver County is number 45 of 87 counting from the hardest. Across the whole country it is harder than 75% of counties.
Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Carver County: Pennington County (16.5), Dakota County (16.3), Wabasha County (16.4).