How hard is the water in Putnam County, FL?
0.5 grains per gallon
You do not need a softener here.
The median hardness measured in Putnam County, FL is 9 mg/L as calcium carbonate, which is 0.5 gpg. That is soft on the USGS scale. It comes from 106 samples at 34 sites between 1990 and 2017, 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 0.2 and 5.3 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
You can skip the softener. At 0.5 gpg the most a softener would fix is the odd water spot. If a salesperson in Putnam County says otherwise, ask to see their reading in grains per gallon and compare it with this one. Because Putnam 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 0.1 to 27.8 gpg
The softest single sample on record in Putnam County was 0.9 mg/L and the hardest 476.3 mg/L, a 529-fold gap. The top quarter of sites read above 5.3 gpg and the bottom quarter below 0.2 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.
Wells 0.5 gpg, rivers and lakes 10.9 gpg
106 groundwater samples from 34 wells put the median at 8.7 mg/L. 4,815 surface samples from 108 sites put it at 185.9 mg/L. In Putnam County the rivers and lakes come out 10.4 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer can deliver noticeably different water from a private well next door.
Putnam County against the rest of Florida
Among the 67 Florida counties with data, Putnam County is number 63 of 67 counting from the hardest. Across the whole country it is harder than 3% of counties.
Softest in Florida: Washington County at 0.3 gpg. Hardest: Sarasota County at 32.2 gpg. Closest to Putnam County: Okaloosa County (0.5), Walton County (0.4), Baker County (0.7).