How hard is the water in Metcalfe County, KY?
7.1 grains per gallon
A softener is worth it here.
The median hardness measured in Metcalfe County, KY is 122 mg/L as calcium carbonate, which is 7.1 gpg. That is hard on the USGS scale. It comes from 9 samples at 3 sites between 2006 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 6.6 and 9.3 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 7.1 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Metcalfe County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 6.1 to 11.4 gpg
The softest single sample on record in Metcalfe County was 104 mg/L and the hardest 195 mg/L, a 2-fold gap. The top quarter of sites read above 9.3 gpg and the bottom quarter below 6.6 gpg.
Wells 9.3 gpg, rivers and lakes 6.1 gpg
6 groundwater samples from 2 wells put the median at 158.5 mg/L. 3 surface samples from 1 sites put it at 104 mg/L. In Metcalfe County the wells come out 3.2 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 156 lb of salt a year (4 bags of 40 lb, about $28), 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 $128 a year.
Sizing at 7.1 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 426 | 24,000 | 52 lb |
| 2 | 852 | 24,000 | 104 lb |
| 4 | 1,704 | 24,000 | 207 lb |
| 6 | 2,556 | 24,000 | 311 lb |
Metcalfe County against the rest of Kentucky
Among the 104 Kentucky counties with data, Metcalfe County is number 59 of 104 counting from the hardest. Across the whole country it is harder than 39% of counties.
Softest in Kentucky: Letcher County at 0.3 gpg. Hardest: Jefferson County at 32.9 gpg. Closest to Metcalfe County: Crittenden County (7.1), Lawrence County (7.1), Caldwell County (7.3).