How hard is the water in Portage County, WI?
16.4 grains per gallon
A softener will pay its way here.
The median hardness measured in Portage County, WI is 281 mg/L as calcium carbonate, which is 16.4 gpg. That is very hard on the USGS scale. It comes from 119 samples at 51 sites between 1990 and 2026, 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 15.4 and 18.6 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: high (how it is measured).
What to do next
At 16.4 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 7.6 to 25.2 gpg
The softest single sample on record in Portage County was 130 mg/L and the hardest 431 mg/L, a 3-fold gap. The top quarter of sites read above 18.6 gpg and the bottom quarter below 15.4 gpg.
Wells 16.4 gpg, rivers and lakes 8.5 gpg
119 groundwater samples from 51 wells put the median at 281 mg/L. 200 surface samples from 26 sites put it at 145.1 mg/L. In Portage County the wells come out 7.9 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 359 lb of salt a year (9 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 16.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 984 | 24,000 | 120 lb |
| 2 | 1,968 | 24,000 | 239 lb |
| 4 | 3,936 | 32,000 | 479 lb |
| 6 | 5,904 | 48,000 | 718 lb |
Portage County against the rest of Wisconsin
Among the 72 Wisconsin counties with data, Portage County is number 22 of 72 counting from the hardest. Across the whole country it is harder than 74% of counties.
Softest in Wisconsin: Vilas County at 1.4 gpg. Hardest: Calumet County at 28.4 gpg. Closest to Portage County: Door County (16.4), Pierce County (16.6), Waupaca County (16.6).