How hard is the water in Limestone County, AL?

3.4 grains per gallon

You do not need a softener here.

The median hardness measured in Limestone County, AL is 59 mg/L as calcium carbonate, which is 3.4 gpg. That is soft on the USGS scale. It comes from 25 samples at 12 sites between 1998 and 2025, 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 1.3 and 4.9 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

You can skip the softener. At 3.4 gpg the most a softener would fix is the odd water spot. If a salesperson in Limestone County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Limestone 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 0.3 to 14.0 gpg

The softest single sample on record in Limestone County was 5 mg/L and the hardest 239 mg/L, a 48-fold gap. The top quarter of sites read above 4.9 gpg and the bottom quarter below 1.3 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 3.4 gpg, rivers and lakes 3.7 gpg

25 groundwater samples from 12 wells put the median at 58.5 mg/L. 480 surface samples from 45 sites put it at 64 mg/L. In Limestone County the rivers and lakes come out 0.3 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.

Limestone County against the rest of Alabama

Among the 67 Alabama counties with data, Limestone County is number 20 of 67 counting from the hardest. Across the whole country it is harder than 24% of counties.

Softest in Alabama: Washington County at 0.2 gpg. Hardest: Walker County at 13.1 gpg. Closest to Limestone County: Cherokee County (3.5), Bibb County (3.3), Sumter County (3.2).