How hard is the water in Grand Isle County, VT?

3.5 grains per gallon

You do not need a softener here.

The median hardness measured in Grand Isle County, VT is 59 mg/L as calcium carbonate, which is 3.5 gpg. That is soft on the USGS scale. It comes from 4 samples at 4 sites between 2016 and 2024, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 3.3 and 3.8 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: low (how it is measured).

What to do next

You can skip the softener. At 3.5 gpg the most a softener would fix is the odd water spot. If a salesperson in Grand Isle County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Grand Isle 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.

Grand Isle County against the rest of Vermont

Among the 14 Vermont counties with data, Grand Isle County is number 11 of 14 counting from the hardest. Across the whole country it is harder than 24% of counties.

Softest in Vermont: Essex County at 1 gpg. Hardest: Orange County at 7.7 gpg. Closest to Grand Isle County: Washington County (3.5), Chittenden County (3.9), Orleans County (4.3).