How hard is the water in Marshall County, KY?

2.8 grains per gallon

You do not need a softener here.

The median hardness measured in Marshall County, KY is 48 mg/L as calcium carbonate, which is 2.8 gpg. That is soft on the USGS scale. It comes from 23 samples at 2 sites between 2000 and 2013, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 2.1 and 3.5 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 2.8 gpg the most a softener would fix is the odd water spot. If a salesperson in Marshall County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Marshall 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 1.4 to 4.2 gpg

The softest single sample on record in Marshall County was 23.8 mg/L and the hardest 72.5 mg/L, a 3-fold gap. The top quarter of sites read above 3.5 gpg and the bottom quarter below 2.1 gpg.

Wells 1.4 gpg, rivers and lakes 4.2 gpg

1 groundwater samples from 1 wells put the median at 23.8 mg/L. 22 surface samples from 1 sites put it at 72.5 mg/L. In Marshall County the rivers and lakes come out 2.8 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.

Marshall County against the rest of Kentucky

Among the 104 Kentucky counties with data, Marshall County is number 95 of 104 counting from the hardest. Across the whole country it is harder than 21% of counties.

Softest in Kentucky: Letcher County at 0.3 gpg. Hardest: Jefferson County at 32.9 gpg. Closest to Marshall County: Fulton County (2.8), Wolfe County (2.9), McCreary County (2.6).