How hard is the water in Trigg County, KY?
11.1 grains per gallon
A softener will pay its way here.
The median hardness measured in Trigg County, KY is 190 mg/L as calcium carbonate, which is 11.1 gpg. That is very hard on the USGS scale. It comes from 403 samples at 10 sites between 1990 and 2023, 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 11.9 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: high (how it is measured).
What to do next
At 11.1 gpg a softener pays its way here. Before you buy, check the quoted unit's grain capacity against the sizing table below, and ask whether it regenerates on demand, which uses less salt than a timer. Call your utility for its own report if you are on city water. Because Trigg 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 5.8 to 14.1 gpg
The softest single sample on record in Trigg County was 99.2 mg/L and the hardest 241 mg/L, a 2-fold gap. The top quarter of sites read above 11.9 gpg and the bottom quarter below 6.6 gpg.
Wells 14.1 gpg, rivers and lakes 10.8 gpg
3 groundwater samples from 1 wells put the median at 241 mg/L. 400 surface samples from 9 sites put it at 185.5 mg/L. In Trigg County the wells come out 3.3 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 242 lb of salt a year (7 bags of 40 lb, about $44), 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 $144 a year.
Sizing at 11.1 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 666 | 24,000 | 81 lb |
| 2 | 1,332 | 24,000 | 162 lb |
| 4 | 2,664 | 24,000 | 324 lb |
| 6 | 3,996 | 32,000 | 486 lb |
Trigg County against the rest of Kentucky
Among the 104 Kentucky counties with data, Trigg County is number 27 of 104 counting from the hardest. Across the whole country it is harder than 55% of counties.
Softest in Kentucky: Letcher County at 0.3 gpg. Hardest: Jefferson County at 32.9 gpg. Closest to Trigg County: Wayne County (11), Barren County (11.2), Logan County (11.2).