How hard is the water in Harrison County, MO?
11.8 grains per gallon
A softener will pay its way here.
The median hardness measured in Harrison 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 127 samples at 11 sites between 1999 and 2023, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 11.5 and 12.4 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: high (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.
More on sizing a softener for your household.
From 10.5 to 14.0 gpg
The softest single sample on record in Harrison County was 179 mg/L and the hardest 239 mg/L, a 1-fold gap. The top quarter of sites read above 12.4 gpg and the bottom quarter below 11.5 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 257 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 |
Harrison County against the rest of Missouri
Among the 110 Missouri counties with data, Harrison County is number 56 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 Harrison County: Adair County (11.8), Dade County (11.7), Johnson County (11.7).