How hard is the water in Butte County, ID?
10.2 grains per gallon
A softener is worth it here.
The median hardness measured in Butte County, ID is 174 mg/L as calcium carbonate, which is 10.2 gpg. That is hard on the USGS scale. It comes from 676 samples at 194 sites between 1990 and 2023, drawn from groundwater wells, which is what most taps and private wells in the county draw on.
How much it varies here
Half the sites came in between 9.1 and 12.9 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: high (how it is measured).
What to do next
At 10.2 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Butte County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 1.8 to 77.1 gpg
The softest single sample on record in Butte County was 30.6 mg/L and the hardest 1,320 mg/L, a 43-fold gap. The top quarter of sites read above 12.9 gpg and the bottom quarter below 9.1 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 10.2 gpg, rivers and lakes 60.2 gpg
676 groundwater samples from 194 wells put the median at 174 mg/L. 17 surface samples from 15 sites put it at 1030 mg/L. In Butte County the rivers and lakes come out 50.0 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, a 24,000-grain unit covers a week between regenerations. Expect about 222 lb of salt a year (6 bags of 40 lb, about $40), 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 $140 a year.
Sizing at 10.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 612 | 24,000 | 74 lb |
| 2 | 1,224 | 24,000 | 149 lb |
| 4 | 2,448 | 24,000 | 298 lb |
| 6 | 3,672 | 32,000 | 447 lb |
Butte County against the rest of Idaho
Among the 44 Idaho counties with data, Butte County is number 19 of 44 counting from the hardest. Across the whole country it is harder than 52% of counties.
Softest in Idaho: Valley County at 1.3 gpg. Hardest: Caribou County at 23 gpg. Closest to Butte County: Blaine County (10.3), Madison County (9.9), Canyon County (10.7).