How hard is the water in Gibson County, IN?
14.2 grains per gallon
A softener will pay its way here.
The median hardness measured in Gibson County, IN is 243 mg/L as calcium carbonate, which is 14.2 gpg. That is very hard on the USGS scale. It comes from 689 samples at 32 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 12.3 and 21.5 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 14.2 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 8.1 to 122.7 gpg
The softest single sample on record in Gibson County was 138 mg/L and the hardest 2,100 mg/L, a 15-fold gap. The top quarter of sites read above 21.5 gpg and the bottom quarter below 12.3 gpg.
Wells 30.6 gpg, rivers and lakes 14 gpg
2 groundwater samples from 2 wells put the median at 523 mg/L. 687 surface samples from 30 sites put it at 239.8 mg/L. In Gibson County the wells come out 16.6 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river 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 309 lb of salt a year (8 bags of 40 lb, about $56), 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 $156 a year.
Sizing at 14.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 852 | 24,000 | 104 lb |
| 2 | 1,704 | 24,000 | 207 lb |
| 4 | 3,408 | 24,000 | 415 lb |
| 6 | 5,112 | 40,000 | 622 lb |
Gibson County against the rest of Indiana
Among the 91 Indiana counties with data, Gibson County is number 63 of 91 counting from the hardest. Across the whole country it is harder than 67% of counties.
Softest in Indiana: Brown County at 3.8 gpg. Hardest: Warrick County at 40.3 gpg. Closest to Gibson County: Dearborn County (13.9), Elkhart County (13.9), LaGrange County (14.8).