How hard is the water in Chatham County, GA?

5.9 grains per gallon

Optional: a softener helps, but plenty of homes skip it.

The median hardness measured in Chatham County, GA is 101 mg/L as calcium carbonate, which is 5.9 gpg. That is moderately hard on the USGS scale. It comes from 42 samples at 18 sites between 1997 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 5.6 and 17 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: high (how it is measured).

What to do next

At 5.9 gpg this is your call. Look for white film on glasses and crust on the shower head: if you see little of either, you can live without one. If you do want one, a 24,000-grain unit is enough, so ask for that size rather than a bigger one. Because Chatham 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 3.7 to 196.9 gpg

The softest single sample on record in Chatham County was 63.2 mg/L and the hardest 3,370 mg/L, a 53-fold gap. The top quarter of sites read above 17 gpg and the bottom quarter below 5.6 gpg.

Wells 5.9 gpg, rivers and lakes 6.9 gpg

42 groundwater samples from 18 wells put the median at 100.7 mg/L. 931 surface samples from 42 sites put it at 118.3 mg/L. In Chatham County the rivers and lakes come out 1.0 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.

What a softener would cost to run

For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 128 lb of salt a year (4 bags of 40 lb, about $23), 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 $123 a year.

Sizing at 5.9 gpg

Chatham County against the rest of Georgia

Among the 159 Georgia counties with data, Chatham County is number 18 of 159 counting from the hardest. Across the whole country it is harder than 34% of counties.

Softest in Georgia: Richmond County at 0.2 gpg. Hardest: Glynn County at 13.6 gpg. Closest to Chatham County: Early County (5.8), Whitfield County (5.7), Baker County (6.2).