How hard is the water in Iron County, WI?

2.9 grains per gallon

You do not need a softener here.

The median hardness measured in Iron County, WI is 50 mg/L as calcium carbonate, which is 2.9 gpg. That is soft on the USGS scale. It comes from 462 samples at 33 sites between 1990 and 2019, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 2.4 and 3.3 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

You can skip the softener. At 2.9 gpg the most a softener would fix is the odd water spot. If a salesperson in Iron County says otherwise, ask to see their reading in grains per gallon and compare it with this one.

More on when a softener is not worth it.

From 1.6 to 5.4 gpg

The softest single sample on record in Iron County was 27 mg/L and the hardest 92.6 mg/L, a 3-fold gap. The top quarter of sites read above 3.3 gpg and the bottom quarter below 2.4 gpg.

Iron County against the rest of Wisconsin

Among the 72 Wisconsin counties with data, Iron County is number 63 of 72 counting from the hardest. Across the whole country it is harder than 21% of counties.

Softest in Wisconsin: Vilas County at 1.4 gpg. Hardest: Calumet County at 28.4 gpg. Closest to Iron County: Marathon County (3.2), Price County (2.5), Bayfield County (3.3).