How hard is the water in Harmon County, OK?
120.9 grains per gallon
A softener will pay its way here.
The median hardness measured in Harmon County, OK is 2070 mg/L as calcium carbonate, which is 120.9 gpg. That is very hard on the USGS scale. It comes from 45 samples at 1 sites between 1994 and 2011, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 120.9 and 120.9 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: low (how it is measured).
What to do next
At 120.9 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 120.9 to 120.9 gpg
The softest single sample on record in Harmon County was 2070 mg/L and the hardest 2,070 mg/L, a 1-fold gap. The top quarter of sites read above 120.9 gpg and the bottom quarter below 120.9 gpg.
What a softener would cost to run
For a household of 3, the water is harder than a standard single tank handles in a week, so plan on a larger or twin-tank unit. Expect about 2,641 lb of salt a year (67 bags of 40 lb, about $475), 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 $575 a year.
Sizing at 120.9 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 7,254 | 64,000 | 883 lb |
| 2 | 14,508 | twin tank | 1,765 lb |
| 4 | 29,016 | twin tank | 3,530 lb |
| 6 | 43,524 | twin tank | 5,295 lb |
Harmon County against the rest of Oklahoma
Among the 77 Oklahoma counties with data, Harmon County is number 2 of 77 counting from the hardest. Across the whole country it is harder than 100% of counties.
Softest in Oklahoma: McCurtain County at 0.8 gpg. Hardest: Greer County at 125 gpg. Closest to Harmon County: Greer County (125), Dewey County (116.4), Custer County (115.8).