How hard is the water in Monroe County, AR?
22.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Monroe County, AR is 382 mg/L as calcium carbonate, which is 22.3 gpg. That is very hard on the USGS scale. It comes from 155 samples at 61 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 15.2 and 29 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: high (how it is measured).
What to do next
At 22.3 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.
More on sizing a softener for your household.
From 0.6 to 44.5 gpg
The softest single sample on record in Monroe County was 10 mg/L and the hardest 762 mg/L, a 76-fold gap. The top quarter of sites read above 29 gpg and the bottom quarter below 15.2 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 22.3 gpg, rivers and lakes 3.5 gpg
155 groundwater samples from 61 wells put the median at 382 mg/L. 499 surface samples from 8 sites put it at 59.8 mg/L. In Monroe County the wells come out 18.8 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. 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 32,000-grain unit covers a week between regenerations. Expect about 487 lb of salt a year (13 bags of 40 lb, about $88), 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 $188 a year.
Sizing at 22.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,338 | 24,000 | 163 lb |
| 2 | 2,676 | 24,000 | 326 lb |
| 4 | 5,352 | 40,000 | 651 lb |
| 6 | 8,028 | 64,000 | 977 lb |
Monroe County against the rest of Arkansas
Among the 75 Arkansas counties with data, Monroe County is number 3 of 75 counting from the hardest. Across the whole country it is harder than 88% of counties.
Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Monroe County: Crawford County (22.4), Arkansas County (21.3), Prairie County (23.9).