How hard is the water in Clermont County, OH?
12.5 grains per gallon
A softener will pay its way here.
The median hardness measured in Clermont County, OH is 214 mg/L as calcium carbonate, which is 12.5 gpg. That is very hard on the USGS scale. It comes from 728 samples at 112 sites between 1990 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 10.1 and 14.1 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 12.5 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. Because Clermont 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 6.1 to 106.9 gpg
The softest single sample on record in Clermont County was 104 mg/L and the hardest 1,830 mg/L, an 18-fold gap. The top quarter of sites read above 14.1 gpg and the bottom quarter below 10.1 gpg.
Wells 16.5 gpg, rivers and lakes 12.2 gpg
5 groundwater samples from 3 wells put the median at 282 mg/L. 619 surface samples from 97 sites put it at 208 mg/L. In Clermont County the wells come out 4.3 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 273 lb of salt a year (7 bags of 40 lb, about $49), 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 $149 a year.
Sizing at 12.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 750 | 24,000 | 91 lb |
| 2 | 1,500 | 24,000 | 183 lb |
| 4 | 3,000 | 24,000 | 365 lb |
| 6 | 4,500 | 32,000 | 548 lb |
Clermont County against the rest of Ohio
Among the 88 Ohio counties with data, Clermont County is number 75 of 88 counting from the hardest. Across the whole country it is harder than 60% of counties.
Softest in Ohio: Scioto County at 5.7 gpg. Hardest: Perry County at 113.3 gpg. Closest to Clermont County: Adams County (12.4), Mahoning County (12.6), Cuyahoga County (12.1).