How hard is the water in Cook County, GA?

1.9 grains per gallon

You do not need a softener here.

The median hardness measured in Cook County, GA is 33 mg/L as calcium carbonate, which is 1.9 gpg. That is soft on the USGS scale. It comes from 15 samples at 5 sites between 1991 and 2023, 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 1.4 and 7.8 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 1.9 gpg the most a softener would fix is the odd water spot. If a salesperson in Cook County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Cook 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 11.0 gpg

The softest single sample on record in Cook County was 4.4 mg/L and the hardest 188 mg/L, a 43-fold gap. The top quarter of sites read above 7.8 gpg and the bottom quarter below 1.4 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 1.9 gpg, rivers and lakes 2 gpg

15 groundwater samples from 5 wells put the median at 33.1 mg/L. 143 surface samples from 14 sites put it at 34.8 mg/L. In Cook County the rivers and lakes come out 0.1 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.

Cook County against the rest of Georgia

Among the 159 Georgia counties with data, Cook County is number 50 of 159 counting from the hardest. Across the whole country it is harder than 15% of counties.

Softest in Georgia: Richmond County at 0.2 gpg. Hardest: Glynn County at 13.6 gpg. Closest to Cook County: Coffee County (1.9), Henry County (1.9), Taliaferro County (1.9).