How hard is the water in Dallas County, AR?

0.7 grains per gallon

You do not need a softener here.

The median hardness measured in Dallas County, AR is 11 mg/L as calcium carbonate, which is 0.7 gpg. That is soft on the USGS scale. It comes from 621 samples at 12 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 2.5 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 0.7 gpg the most a softener would fix is the odd water spot. If a salesperson in Dallas 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 0.4 to 4.0 gpg

The softest single sample on record in Dallas County was 6 mg/L and the hardest 68.5 mg/L, an 11-fold gap. The top quarter of sites read above 2.5 gpg and the bottom quarter below 0.5 gpg.

Wells 3.3 gpg, rivers and lakes 0.5 gpg

1 groundwater samples from 1 wells put the median at 56.4 mg/L. 620 surface samples from 11 sites put it at 9 mg/L. In Dallas County the wells come out 2.8 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.

Dallas County against the rest of Arkansas

Among the 75 Arkansas counties with data, Dallas County is number 70 of 75 counting from the hardest. Across the whole country it is harder than 3% of counties.

Softest in Arkansas: Hempstead County at 0.1 gpg. Hardest: Prairie County at 23.9 gpg. Closest to Dallas County: Pope County (0.6), Calhoun County (0.6), Johnson County (0.6).