How hard is the water in Calhoun County, AL?
6.8 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Calhoun County, AL is 117 mg/L as calcium carbonate, which is 6.8 gpg. That is moderately hard on the USGS scale. It comes from 37 samples at 21 sites between 1993 and 2025, drawn from groundwater wells, which is what most taps and private wells in the county draw on.
How much it varies here
Half the sites came in between 5.7 and 7.8 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 6.8 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 Calhoun 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 18.0 gpg
The softest single sample on record in Calhoun County was 1.1 mg/L and the hardest 308 mg/L, a 280-fold gap. The top quarter of sites read above 7.8 gpg and the bottom quarter below 5.7 gpg.
Wells 6.8 gpg, rivers and lakes 5 gpg
37 groundwater samples from 21 wells put the median at 117 mg/L. 236 surface samples from 33 sites put it at 85.9 mg/L. In Calhoun County the wells come out 1.8 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 149 lb of salt a year (4 bags of 40 lb, about $27), 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 $127 a year.
Sizing at 6.8 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 408 | 24,000 | 50 lb |
| 2 | 816 | 24,000 | 99 lb |
| 4 | 1,632 | 24,000 | 199 lb |
| 6 | 2,448 | 24,000 | 298 lb |
Calhoun County against the rest of Alabama
Among the 67 Alabama counties with data, Calhoun County is number 5 of 67 counting from the hardest. Across the whole country it is harder than 38% of counties.
Softest in Alabama: Washington County at 0.2 gpg. Hardest: Walker County at 13.1 gpg. Closest to Calhoun County: Shelby County (6.5), Morgan County (6.4), Jackson County (5.9).