How hard is the water in Greene County, AR?
3.5 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Greene County, AR is 61 mg/L as calcium carbonate, which is 3.5 gpg. That is moderately hard on the USGS scale. It comes from 62 samples at 6 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 1.5 and 4.7 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 3.5 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 Greene 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 0.6 to 8.1 gpg
The softest single sample on record in Greene County was 9.8 mg/L and the hardest 138 mg/L, a 14-fold gap. The top quarter of sites read above 4.7 gpg and the bottom quarter below 1.5 gpg.
Wells 2.3 gpg, rivers and lakes 3.9 gpg
8 groundwater samples from 2 wells put the median at 40.1 mg/L. 54 surface samples from 4 sites put it at 67.4 mg/L. In Greene County the rivers and lakes come out 1.6 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. 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 77 lb of salt a year (2 bags of 40 lb, about $14), 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 $114 a year.
Sizing at 3.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 210 | 24,000 | 26 lb |
| 2 | 420 | 24,000 | 51 lb |
| 4 | 840 | 24,000 | 102 lb |
| 6 | 1,260 | 24,000 | 153 lb |
Greene County against the rest of Arkansas
Among the 75 Arkansas counties with data, Greene County is number 38 of 75 counting from the hardest. Across the whole country it is harder than 25% of counties.
Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Greene County: Pike County (3.4), Miller County (3.7), Van Buren County (3.4).