How hard is the water in Pine County, MN?

3.3 grains per gallon

You do not need a softener here.

The median hardness measured in Pine County, MN is 56 mg/L as calcium carbonate, which is 3.3 gpg. That is soft on the USGS scale. It comes from 196 samples at 33 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 1.9 and 4 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: high (how it is measured).

What to do next

You can skip the softener. At 3.3 gpg the most a softener would fix is the odd water spot. If a salesperson in Pine County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Pine County straddles a decision line, check your own tap with a $10 test strip before you spend anything.

More on when a softener is not worth it.

From 0.2 to 11.3 gpg

The softest single sample on record in Pine County was 4.2 mg/L and the hardest 194 mg/L, a 46-fold gap. The top quarter of sites read above 4 gpg and the bottom quarter below 1.9 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 2 gpg, rivers and lakes 3.3 gpg

1 groundwater samples from 1 wells put the median at 34.8 mg/L. 194 surface samples from 31 sites put it at 56 mg/L. In Pine County the rivers and lakes come out 1.3 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. The two sources are close, so the county figure should hold whichever one your tap is on.

Pine County against the rest of Minnesota

Among the 87 Minnesota counties with data, Pine County is number 84 of 87 counting from the hardest. Across the whole country it is harder than 23% of counties.

Softest in Minnesota: Lake County at 1.3 gpg. Hardest: Traverse County at 42.6 gpg. Closest to Pine County: Lake of the Woods County (3.1), Cook County (3.7), Koochiching County (2.7).