How hard is the water in Adair County, MO?
11.8 grains per gallon
A softener will pay its way here.
The median hardness measured in Adair County, MO is 202 mg/L as calcium carbonate, which is 11.8 gpg. That is very hard on the USGS scale. It comes from 47 samples at 9 sites between 2004 and 2026, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 5 and 12.3 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: medium (how it is measured).
What to do next
At 11.8 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 Adair 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 2.6 to 13.7 gpg
The softest single sample on record in Adair County was 44.6 mg/L and the hardest 234 mg/L, a 5-fold gap. The top quarter of sites read above 12.3 gpg and the bottom quarter below 5 gpg. So even here some sites draw water soft enough to need nothing at all.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 258 lb of salt a year (7 bags of 40 lb, about $46), 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 $146 a year.
Sizing at 11.8 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 708 | 24,000 | 86 lb |
| 2 | 1,416 | 24,000 | 172 lb |
| 4 | 2,832 | 24,000 | 345 lb |
| 6 | 4,248 | 32,000 | 517 lb |
Adair County against the rest of Missouri
Among the 110 Missouri counties with data, Adair County is number 57 of 110 counting from the hardest. Across the whole country it is harder than 58% of counties.
Softest in Missouri: Livingston County at 4.1 gpg. Hardest: Reynolds County at 96.7 gpg. Closest to Adair County: Harrison County (11.8), Dade County (11.7), Johnson County (11.7).