How hard is the water in Carter County, KY?

4.4 grains per gallon

Optional: a softener helps, but plenty of homes skip it.

The median hardness measured in Carter County, KY is 76 mg/L as calcium carbonate, which is 4.4 gpg. That is moderately hard on the USGS scale. It comes from 104 samples at 5 sites between 2002 and 2007, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 3.9 and 6.8 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: medium (how it is measured).

What to do next

At 4.4 gpg this is your call. Look for white film on glasses and crust on the shower head: if you see little of either, you can live without one. If you do want one, a 24,000-grain unit is enough, so ask for that size rather than a bigger one.

More on when a softener is not worth it.

From 3.0 to 8.2 gpg

The softest single sample on record in Carter County was 51.4 mg/L and the hardest 140 mg/L, a 3-fold gap. The top quarter of sites read above 6.8 gpg and the bottom quarter below 3.9 gpg.

What a softener would cost to run

For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 97 lb of salt a year (3 bags of 40 lb, about $17), and roughly 2,346 gallons of regeneration water. Installed, most units run $1,000 to $4,500; spread over 15 years with salt, that is about $117 a year.

Sizing at 4.4 gpg

Carter County against the rest of Kentucky

Among the 104 Kentucky counties with data, Carter County is number 86 of 104 counting from the hardest. Across the whole country it is harder than 28% of counties.

Softest in Kentucky: Letcher County at 0.3 gpg. Hardest: Jefferson County at 32.9 gpg. Closest to Carter County: Adair County (4.5), Russell County (4.5), Powell County (4.8).