How hard is the water in Hamilton County, KS?
87.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Hamilton County, KS is 1500 mg/L as calcium carbonate, which is 87.6 gpg. That is very hard on the USGS scale. It comes from 186 samples at 6 sites between 1990 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 34.1 and 92.9 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 87.6 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 13.7 to 128.5 gpg
The softest single sample on record in Hamilton County was 234 mg/L and the hardest 2,200 mg/L, a 9-fold gap. The top quarter of sites read above 92.9 gpg and the bottom quarter below 34.1 gpg.
Wells 15 gpg, rivers and lakes 91.1 gpg
2 groundwater samples from 2 wells put the median at 256 mg/L. 184 surface samples from 4 sites put it at 1560 mg/L. In Hamilton County the rivers and lakes come out 76.1 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, the water is harder than a standard single tank handles in a week, so plan on a larger or twin-tank unit. Expect about 1,914 lb of salt a year (48 bags of 40 lb, about $344), 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 $444 a year.
Sizing at 87.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 5,256 | 40,000 | 639 lb |
| 2 | 10,512 | 80,000 | 1,279 lb |
| 4 | 21,024 | twin tank | 2,558 lb |
| 6 | 31,536 | twin tank | 3,837 lb |
Hamilton County against the rest of Kansas
Among the 105 Kansas counties with data, Hamilton County is number 2 of 105 counting from the hardest. Across the whole country it is harder than 99% of counties.
Softest in Kansas: Woodson County at 6.3 gpg. Hardest: Linn County at 114.5 gpg. Closest to Hamilton County: Gove County (64.3), Linn County (114.5), Kearny County (60.2).