How hard is the water in Marinette County, WI?
11.5 grains per gallon
A softener will pay its way here.
The median hardness measured in Marinette County, WI is 198 mg/L as calcium carbonate, which is 11.5 gpg. That is very hard on the USGS scale. It comes from 9 samples at 5 sites between 1990 and 2020, 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 7 and 11.9 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 11.5 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 Marinette 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 6.5 to 16.4 gpg
The softest single sample on record in Marinette County was 111 mg/L and the hardest 281 mg/L, a 3-fold gap. The top quarter of sites read above 11.9 gpg and the bottom quarter below 7 gpg.
Wells 11.5 gpg, rivers and lakes 7.2 gpg
9 groundwater samples from 5 wells put the median at 197.5 mg/L. 286 surface samples from 20 sites put it at 123.5 mg/L. In Marinette County the wells come out 4.3 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 252 lb of salt a year (7 bags of 40 lb, about $45), 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 $145 a year.
Sizing at 11.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 690 | 24,000 | 84 lb |
| 2 | 1,380 | 24,000 | 168 lb |
| 4 | 2,760 | 24,000 | 336 lb |
| 6 | 4,140 | 32,000 | 504 lb |
Marinette County against the rest of Wisconsin
Among the 72 Wisconsin counties with data, Marinette County is number 40 of 72 counting from the hardest. Across the whole country it is harder than 57% of counties.
Softest in Wisconsin: Vilas County at 1.4 gpg. Hardest: Calumet County at 28.4 gpg. Closest to Marinette County: La Crosse County (12.3), Pepin County (12.3), Adams County (10.6).