How hard is the water in Miami County, IN?
19.5 grains per gallon
A softener will pay its way here.
The median hardness measured in Miami County, IN is 333 mg/L as calcium carbonate, which is 19.5 gpg. That is very hard on the USGS scale. It comes from 327 samples at 9 sites between 1991 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 16.2 and 21.8 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 19.5 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 13.8 to 26.7 gpg
The softest single sample on record in Miami County was 236 mg/L and the hardest 457.5 mg/L, a 2-fold gap. The top quarter of sites read above 21.8 gpg and the bottom quarter below 16.2 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 425 lb of salt a year (11 bags of 40 lb, about $76), 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 $176 a year.
Sizing at 19.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,170 | 24,000 | 142 lb |
| 2 | 2,340 | 24,000 | 285 lb |
| 4 | 4,680 | 40,000 | 569 lb |
| 6 | 7,020 | 64,000 | 854 lb |
Miami County against the rest of Indiana
Among the 91 Indiana counties with data, Miami County is number 20 of 91 counting from the hardest. Across the whole country it is harder than 83% of counties.
Softest in Indiana: Brown County at 3.8 gpg. Hardest: Warrick County at 40.3 gpg. Closest to Miami County: Fayette County (19.4), Pike County (19.4), Madison County (19.3).