How hard is the water in Polk County, AR?

0.8 grains per gallon

You do not need a softener here.

The median hardness measured in Polk County, AR is 13 mg/L as calcium carbonate, which is 0.8 gpg. That is soft on the USGS scale. It comes from 1,080 samples at 29 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 0.5 and 1.1 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

You can skip the softener. At 0.8 gpg the most a softener would fix is the odd water spot. If a salesperson in Polk County says otherwise, ask to see their reading in grains per gallon and compare it with this one.

More on when a softener is not worth it.

From 0.3 to 10.4 gpg

The softest single sample on record in Polk County was 5 mg/L and the hardest 177.5 mg/L, a 36-fold gap. The top quarter of sites read above 1.1 gpg and the bottom quarter below 0.5 gpg.

Wells 5.4 gpg, rivers and lakes 0.8 gpg

1 groundwater samples from 1 wells put the median at 92 mg/L. 1,079 surface samples from 28 sites put it at 13.2 mg/L. In Polk County the wells come out 4.6 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.

Polk County against the rest of Arkansas

Among the 75 Arkansas counties with data, Polk County is number 66 of 75 counting from the hardest. Across the whole country it is harder than 4% of counties.

Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Polk County: Bradley County (0.8), Perry County (0.7), Scott County (0.8).