How hard is the water in Carroll County, AR?
11.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Carroll County, AR is 193 mg/L as calcium carbonate, which is 11.3 gpg. That is very hard on the USGS scale. It comes from 28 samples at 21 sites between 1990 and 2026, 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 10 and 13.5 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 11.3 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 Carroll 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 5.2 to 21.8 gpg
The softest single sample on record in Carroll County was 88.6 mg/L and the hardest 374 mg/L, a 4-fold gap. The top quarter of sites read above 13.5 gpg and the bottom quarter below 10 gpg.
Wells 11.3 gpg, rivers and lakes 8.1 gpg
28 groundwater samples from 21 wells put the median at 193 mg/L. 2,068 surface samples from 33 sites put it at 138.5 mg/L. In Carroll 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 246 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 11.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 678 | 24,000 | 82 lb |
| 2 | 1,356 | 24,000 | 165 lb |
| 4 | 2,712 | 24,000 | 330 lb |
| 6 | 4,068 | 32,000 | 495 lb |
Carroll County against the rest of Arkansas
Among the 75 Arkansas counties with data, Carroll County is number 18 of 75 counting from the hardest. Across the whole country it is harder than 56% of counties.
Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Carroll County: Randolph County (11.7), Izard County (10.3), Searcy County (10.3).