How hard is the water in Knox County, NE?
14.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Knox County, NE is 244 mg/L as calcium carbonate, which is 14.3 gpg. That is very hard on the USGS scale. It comes from 89 samples at 8 sites between 1990 and 2020, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 12.2 and 21.6 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 14.3 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 6.5 to 42.3 gpg
The softest single sample on record in Knox County was 111 mg/L and the hardest 723.5 mg/L, a 7-fold gap. The top quarter of sites read above 21.6 gpg and the bottom quarter below 12.2 gpg.
Wells 42.3 gpg, rivers and lakes 14.1 gpg
2 groundwater samples from 1 wells put the median at 723.5 mg/L. 87 surface samples from 7 sites put it at 241.7 mg/L. In Knox County the wells come out 28.2 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 312 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 14.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 858 | 24,000 | 104 lb |
| 2 | 1,716 | 24,000 | 209 lb |
| 4 | 3,432 | 32,000 | 418 lb |
| 6 | 5,148 | 40,000 | 626 lb |
Knox County against the rest of Nebraska
Among the 89 Nebraska counties with data, Knox County is number 51 of 89 counting from the hardest. Across the whole country it is harder than 67% of counties.
Softest in Nebraska: Blaine County at 2.1 gpg. Hardest: Cedar County at 36.5 gpg. Closest to Knox County: Sherman County (14.2), Madison County (14.3), Sioux County (14.3).