How hard is the water in Flagler County, FL?
7.8 grains per gallon
A softener is worth it here.
The median hardness measured in Flagler County, FL is 134 mg/L as calcium carbonate, which is 7.8 gpg. That is hard on the USGS scale. It comes from 846 samples at 33 sites between 1997 and 2019, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 4.9 and 20.9 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: high (how it is measured).
What to do next
At 7.8 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Flagler County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 1.1 to 235.7 gpg
The softest single sample on record in Flagler County was 18 mg/L and the hardest 4,034.2 mg/L, a 224-fold gap. The top quarter of sites read above 20.9 gpg and the bottom quarter below 4.9 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 18 gpg, rivers and lakes 7.7 gpg
3 groundwater samples from 3 wells put the median at 308 mg/L. 843 surface samples from 30 sites put it at 132.5 mg/L. In Flagler County the wells come out 10.3 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 171 lb of salt a year (5 bags of 40 lb, about $31), 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 $131 a year.
Sizing at 7.8 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 468 | 24,000 | 57 lb |
| 2 | 936 | 24,000 | 114 lb |
| 4 | 1,872 | 24,000 | 228 lb |
| 6 | 2,808 | 24,000 | 342 lb |
Flagler County against the rest of Florida
Among the 67 Florida counties with data, Flagler County is number 43 of 67 counting from the hardest. Across the whole country it is harder than 42% of counties.
Softest in Florida: Washington County at 0.3 gpg. Hardest: Sarasota County at 32.2 gpg. Closest to Flagler County: Hillsborough County (7.7), Hamilton County (8), Osceola County (8.1).