How hard is the water in Cimarron County, OK?
12.9 grains per gallon
A softener will pay its way here.
The median hardness measured in Cimarron County, OK is 221 mg/L as calcium carbonate, which is 12.9 gpg. That is very hard on the USGS scale. It comes from 12 samples at 8 sites between 1990 and 2021, 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 11.7 and 15.8 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 12.9 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 10.6 to 21.3 gpg
The softest single sample on record in Cimarron County was 182 mg/L and the hardest 365 mg/L, a 2-fold gap. The top quarter of sites read above 15.8 gpg and the bottom quarter below 11.7 gpg.
Wells 12.9 gpg, rivers and lakes 33.8 gpg
12 groundwater samples from 8 wells put the median at 220.5 mg/L. 50 surface samples from 7 sites put it at 579 mg/L. In Cimarron County the rivers and lakes come out 20.9 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer 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 281 lb of salt a year (8 bags of 40 lb, about $51), 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 $151 a year.
Sizing at 12.9 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 774 | 24,000 | 94 lb |
| 2 | 1,548 | 24,000 | 188 lb |
| 4 | 3,096 | 24,000 | 377 lb |
| 6 | 4,644 | 40,000 | 565 lb |
Cimarron County against the rest of Oklahoma
Among the 77 Oklahoma counties with data, Cimarron County is number 42 of 77 counting from the hardest. Across the whole country it is harder than 62% of counties.
Softest in Oklahoma: McCurtain County at 0.8 gpg. Hardest: Greer County at 125 gpg. Closest to Cimarron County: Pawnee County (12.9), Beaver County (12.7), Logan County (13.1).