How hard is the water in Fulton County, GA?

1.4 grains per gallon

You do not need a softener here.

The median hardness measured in Fulton County, GA is 23 mg/L as calcium carbonate, which is 1.4 gpg. That is soft on the USGS scale. It comes from 18 samples at 18 sites between 1993 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 1 and 2.9 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: medium (how it is measured).

What to do next

You can skip the softener. At 1.4 gpg the most a softener would fix is the odd water spot. If a salesperson in Fulton 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 18.2 gpg

The softest single sample on record in Fulton County was 5.7 mg/L and the hardest 312 mg/L, a 55-fold gap. The top quarter of sites read above 2.9 gpg and the bottom quarter below 1 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 1.4 gpg, rivers and lakes 2.3 gpg

18 groundwater samples from 18 wells put the median at 23.4 mg/L. 5,193 surface samples from 101 sites put it at 40.2 mg/L. In Fulton County the rivers and lakes come out 0.9 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.

Fulton County against the rest of Georgia

Among the 159 Georgia counties with data, Fulton County is number 87 of 159 counting from the hardest. Across the whole country it is harder than 10% of counties.

Softest in Georgia: Richmond County at 0.2 gpg. Hardest: Glynn County at 13.6 gpg. Closest to Fulton County: Banks County (1.3), Franklin County (1.3), Hall County (1.3).