How hard is the water in Jefferson County, OH?
23 grains per gallon
A softener will pay its way here.
The median hardness measured in Jefferson County, OH is 393 mg/L as calcium carbonate, which is 23 gpg. That is very hard on the USGS scale. It comes from 826 samples at 130 sites between 1997 and 2024, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 10.7 and 42.3 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: high (how it is measured).
What to do next
At 23 gpg a softener pays its way here. Before you buy, check the quoted unit's grain capacity against the sizing table below, and ask whether it regenerates on demand, which uses less salt than a timer. Call your utility for its own report if you are on city water.
More on sizing a softener for your household.
From 4.4 to 147.8 gpg
The softest single sample on record in Jefferson County was 75 mg/L and the hardest 2,530 mg/L, a 34-fold gap. The top quarter of sites read above 42.3 gpg and the bottom quarter below 10.7 gpg.
Wells 11.3 gpg, rivers and lakes 22.1 gpg
7 groundwater samples from 2 wells put the median at 194 mg/L. 760 surface samples from 96 sites put it at 377.5 mg/L. In Jefferson County the rivers and lakes come out 10.8 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.
What a softener would cost to run
For a household of 3, a 32,000-grain unit covers a week between regenerations. Expect about 501 lb of salt a year (13 bags of 40 lb, about $90), 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 $190 a year.
Sizing at 23 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,380 | 24,000 | 168 lb |
| 2 | 2,760 | 24,000 | 336 lb |
| 4 | 5,520 | 40,000 | 672 lb |
| 6 | 8,280 | 64,000 | 1,007 lb |
Jefferson County against the rest of Ohio
Among the 88 Ohio counties with data, Jefferson County is number 13 of 88 counting from the hardest. Across the whole country it is harder than 89% of counties.
Softest in Ohio: Scioto County at 5.7 gpg. Hardest: Perry County at 113.3 gpg. Closest to Jefferson County: Clark County (23), Greene County (22.6), Wyandot County (22.5).