How hard is the water in Highland County, OH?
16.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Highland County, OH is 279 mg/L as calcium carbonate, which is 16.3 gpg. That is very hard on the USGS scale. It comes from 281 samples at 50 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 13.5 and 17.9 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 16.3 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 9.3 to 23.3 gpg
The softest single sample on record in Highland County was 159 mg/L and the hardest 399 mg/L, a 3-fold gap. The top quarter of sites read above 17.9 gpg and the bottom quarter below 13.5 gpg.
Wells 18.1 gpg, rivers and lakes 16.2 gpg
6 groundwater samples from 1 wells put the median at 309 mg/L. 237 surface samples from 46 sites put it at 277.3 mg/L. In Highland County the wells come out 1.9 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 356 lb of salt a year (9 bags of 40 lb, about $64), 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 $164 a year.
Sizing at 16.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 978 | 24,000 | 119 lb |
| 2 | 1,956 | 24,000 | 238 lb |
| 4 | 3,912 | 32,000 | 476 lb |
| 6 | 5,868 | 48,000 | 714 lb |
Highland County against the rest of Ohio
Among the 88 Ohio counties with data, Highland County is number 55 of 88 counting from the hardest. Across the whole country it is harder than 73% of counties.
Softest in Ohio: Scioto County at 5.7 gpg. Hardest: Perry County at 113.3 gpg. Closest to Highland County: Ottawa County (16.2), Muskingum County (16.1), Defiance County (15.9).