How hard is the water in Keweenaw County, MI?

2.6 grains per gallon

You do not need a softener here.

The median hardness measured in Keweenaw County, MI is 45 mg/L as calcium carbonate, which is 2.6 gpg. That is soft on the USGS scale. It comes from 92 samples at 17 sites between 1990 and 2023, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 1.6 and 3.5 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 2.6 gpg the most a softener would fix is the odd water spot. If a salesperson in Keweenaw 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 1.1 to 4.7 gpg

The softest single sample on record in Keweenaw County was 19 mg/L and the hardest 80.5 mg/L, a 4-fold gap. The top quarter of sites read above 3.5 gpg and the bottom quarter below 1.6 gpg.

Keweenaw County against the rest of Michigan

Among the 82 Michigan counties with data, Keweenaw County is number 80 of 82 counting from the hardest. Across the whole country it is harder than 20% of counties.

Softest in Michigan: Luce County at 1.9 gpg. Hardest: Wayne County at 47.4 gpg. Closest to Keweenaw County: Missaukee County (3), Houghton County (3.1), Chippewa County (3.1).