How hard is the water in Greenup County, KY?
6.5 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Greenup County, KY is 112 mg/L as calcium carbonate, which is 6.5 gpg. That is moderately hard on the USGS scale. It comes from 435 samples at 7 sites between 1996 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 5.3 and 8.4 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: medium (how it is measured).
What to do next
At 6.5 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. Because Greenup 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 2.7 to 17.6 gpg
The softest single sample on record in Greenup County was 46.6 mg/L and the hardest 301 mg/L, a 6-fold gap. The top quarter of sites read above 8.4 gpg and the bottom quarter below 5.3 gpg.
Wells 17.6 gpg, rivers and lakes 6.4 gpg
1 groundwater samples from 1 wells put the median at 301 mg/L. 434 surface samples from 6 sites put it at 108.8 mg/L. In Greenup County the wells come out 11.2 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 142 lb of salt a year (4 bags of 40 lb, about $26), 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 $126 a year.
Sizing at 6.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 390 | 24,000 | 47 lb |
| 2 | 780 | 24,000 | 95 lb |
| 4 | 1,560 | 24,000 | 190 lb |
| 6 | 2,340 | 24,000 | 285 lb |
Greenup County against the rest of Kentucky
Among the 104 Kentucky counties with data, Greenup County is number 65 of 104 counting from the hardest. Across the whole country it is harder than 37% of counties.
Softest in Kentucky: Letcher County at 0.3 gpg. Hardest: Jefferson County at 32.9 gpg. Closest to Greenup County: Rockcastle County (6.6), Pulaski County (6.7), Edmonson County (6.3).