How hard is the water in Washington County, OH?
19.1 grains per gallon
A softener will pay its way here.
The median hardness measured in Washington County, OH is 327 mg/L as calcium carbonate, which is 19.1 gpg. That is very hard on the USGS scale. It comes from 20 samples at 6 sites between 1997 and 2024, 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 17.4 and 21.3 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: medium (how it is measured).
What to do next
At 19.1 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 16.3 to 22.0 gpg
The softest single sample on record in Washington County was 279 mg/L and the hardest 376 mg/L, a 1-fold gap. The top quarter of sites read above 21.3 gpg and the bottom quarter below 17.4 gpg.
Wells 19.1 gpg, rivers and lakes 10.4 gpg
20 groundwater samples from 6 wells put the median at 326.5 mg/L. 773 surface samples from 119 sites put it at 178 mg/L. In Washington County the wells come out 8.7 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 32,000-grain unit covers a week between regenerations. Expect about 417 lb of salt a year (11 bags of 40 lb, about $75), 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 $175 a year.
Sizing at 19.1 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,146 | 24,000 | 139 lb |
| 2 | 2,292 | 24,000 | 279 lb |
| 4 | 4,584 | 40,000 | 558 lb |
| 6 | 6,876 | 64,000 | 837 lb |
Washington County against the rest of Ohio
Among the 88 Ohio counties with data, Washington County is number 36 of 88 counting from the hardest. Across the whole country it is harder than 82% of counties.
Softest in Ohio: Scioto County at 5.7 gpg. Hardest: Perry County at 113.3 gpg. Closest to Washington County: Seneca County (19.1), Portage County (19), Williams County (19).