How hard is the water in Randolph County, AR?
11.7 grains per gallon
A softener will pay its way here.
The median hardness measured in Randolph County, AR is 201 mg/L as calcium carbonate, which is 11.7 gpg. That is very hard on the USGS scale. It comes from 892 samples at 18 sites between 1990 and 2026, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 8.9 and 15.4 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 11.7 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 Randolph 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 8.2 to 23.2 gpg
The softest single sample on record in Randolph County was 140 mg/L and the hardest 398 mg/L, a 3-fold gap. The top quarter of sites read above 15.4 gpg and the bottom quarter below 8.9 gpg.
Wells 17.5 gpg, rivers and lakes 9.9 gpg
4 groundwater samples from 4 wells put the median at 299 mg/L. 888 surface samples from 14 sites put it at 169 mg/L. In Randolph County the wells come out 7.6 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 256 lb of salt a year (7 bags of 40 lb, about $46), 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 $146 a year.
Sizing at 11.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 702 | 24,000 | 85 lb |
| 2 | 1,404 | 24,000 | 171 lb |
| 4 | 2,808 | 24,000 | 342 lb |
| 6 | 4,212 | 32,000 | 512 lb |
Randolph County against the rest of Arkansas
Among the 75 Arkansas counties with data, Randolph County is number 17 of 75 counting from the hardest. Across the whole country it is harder than 57% of counties.
Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Randolph County: Carroll County (11.3), Boone County (12.3), Lawrence County (12.9).