How hard is the water in McIntosh County, OK?
11 grains per gallon
A softener will pay its way here.
The median hardness measured in McIntosh County, OK is 189 mg/L as calcium carbonate, which is 11 gpg. That is very hard on the USGS scale. It comes from 306 samples at 14 sites between 2000 and 2025, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 6.8 and 16.8 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: high (how it is measured).
What to do next
At 11 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. Because McIntosh County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 5.3 to 57.6 gpg
The softest single sample on record in McIntosh County was 91 mg/L and the hardest 986 mg/L, an 11-fold gap. The top quarter of sites read above 16.8 gpg and the bottom quarter below 6.8 gpg.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 241 lb of salt a year (7 bags of 40 lb, about $43), 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 $143 a year.
Sizing at 11 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 660 | 24,000 | 80 lb |
| 2 | 1,320 | 24,000 | 161 lb |
| 4 | 2,640 | 24,000 | 321 lb |
| 6 | 3,960 | 32,000 | 482 lb |
McIntosh County against the rest of Oklahoma
Among the 77 Oklahoma counties with data, McIntosh County is number 51 of 77 counting from the hardest. Across the whole country it is harder than 55% of counties.
Softest in Oklahoma: McCurtain County at 0.8 gpg. Hardest: Greer County at 125 gpg. Closest to McIntosh County: Lincoln County (11.1), Bryan County (10.8), Hughes County (11.2).