How hard is the water in Poinsett County, AR?
18.4 grains per gallon
A softener will pay its way here.
The median hardness measured in Poinsett County, AR is 315 mg/L as calcium carbonate, which is 18.4 gpg. That is very hard on the USGS scale. It comes from 23 samples at 14 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 14.4 and 22.8 gpg. The whole middle of that range gives the same answer, so a test of your own tap is unlikely to change it. Confidence in the county figure: medium (how it is measured).
What to do next
At 18.4 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.
More on sizing a softener for your household.
From 0.2 to 50.0 gpg
The softest single sample on record in Poinsett County was 4.1 mg/L and the hardest 856 mg/L, a 209-fold gap. The top quarter of sites read above 22.8 gpg and the bottom quarter below 14.4 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 18.4 gpg, rivers and lakes 6.5 gpg
23 groundwater samples from 14 wells put the median at 314.5 mg/L. 147 surface samples from 9 sites put it at 112 mg/L. In Poinsett County the wells come out 11.9 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 401 lb of salt a year (11 bags of 40 lb, about $72), 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 $172 a year.
Sizing at 18.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,104 | 24,000 | 134 lb |
| 2 | 2,208 | 24,000 | 269 lb |
| 4 | 4,416 | 32,000 | 537 lb |
| 6 | 6,624 | 48,000 | 806 lb |
Poinsett County against the rest of Arkansas
Among the 75 Arkansas counties with data, Poinsett County is number 6 of 75 counting from the hardest. Across the whole country it is harder than 80% of counties.
Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Poinsett County: St. Francis County (18.3), Chicot County (17.3), Fulton County (19.7).