How hard is the water in Sequatchie County, TN?
6.4 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Sequatchie County, TN is 110 mg/L as calcium carbonate, which is 6.4 gpg. That is moderately hard on the USGS scale. It comes from 160 samples at 31 sites between 1998 and 2019, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 2.5 and 12.3 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: high (how it is measured).
What to do next
At 6.4 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. Because Sequatchie 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 0.1 to 57.2 gpg
The softest single sample on record in Sequatchie County was 1 mg/L and the hardest 979 mg/L, a 979-fold gap. The top quarter of sites read above 12.3 gpg and the bottom quarter below 2.5 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 140 lb of salt a year (4 bags of 40 lb, about $25), 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 $125 a year.
Sizing at 6.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 384 | 24,000 | 47 lb |
| 2 | 768 | 24,000 | 93 lb |
| 4 | 1,536 | 24,000 | 187 lb |
| 6 | 2,304 | 24,000 | 280 lb |
Sequatchie County against the rest of Tennessee
Among the 95 Tennessee counties with data, Sequatchie County is number 48 of 95 counting from the hardest. Across the whole country it is harder than 36% of counties.
Softest in Tennessee: Fayette County at 0.5 gpg. Hardest: Fentress County at 42.9 gpg. Closest to Sequatchie County: Jackson County (6.3), Macon County (6.3), Humphreys County (6.2).