How hard is the water in Garfield County, OK?
23.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Garfield County, OK is 403 mg/L as calcium carbonate, which is 23.6 gpg. That is very hard on the USGS scale. It comes from 113 samples at 6 sites between 2000 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 20 and 26.4 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 23.6 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 17.4 to 70.2 gpg
The softest single sample on record in Garfield County was 298.5 mg/L and the hardest 1,202.5 mg/L, a 4-fold gap. The top quarter of sites read above 26.4 gpg and the bottom quarter below 20 gpg.
What a softener would cost to run
For a household of 3, a 32,000-grain unit covers a week between regenerations. Expect about 515 lb of salt a year (13 bags of 40 lb, about $93), 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 $193 a year.
Sizing at 23.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,416 | 24,000 | 172 lb |
| 2 | 2,832 | 24,000 | 345 lb |
| 4 | 5,664 | 40,000 | 689 lb |
| 6 | 8,496 | 64,000 | 1,034 lb |
Garfield County against the rest of Oklahoma
Among the 77 Oklahoma counties with data, Garfield County is number 22 of 77 counting from the hardest. Across the whole country it is harder than 90% of counties.
Softest in Oklahoma: McCurtain County at 0.8 gpg. Hardest: Greer County at 125 gpg. Closest to Garfield County: McClain County (24.2), Grant County (21.6), Canadian County (25.9).