How hard is the water in Gooding County, ID?
9.6 grains per gallon
A softener is worth it here.
The median hardness measured in Gooding County, ID is 164 mg/L as calcium carbonate, which is 9.6 gpg. That is hard on the USGS scale. It comes from 324 samples at 85 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 8.9 and 13 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 9.6 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 Gooding 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 1.5 to 20.1 gpg
The softest single sample on record in Gooding County was 26.4 mg/L and the hardest 344 mg/L, a 13-fold gap. The top quarter of sites read above 13 gpg and the bottom quarter below 8.9 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 9.6 gpg, rivers and lakes 11.8 gpg
324 groundwater samples from 85 wells put the median at 164 mg/L. 46 surface samples from 3 sites put it at 202 mg/L. In Gooding County the rivers and lakes come out 2.2 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 209 lb of salt a year (6 bags of 40 lb, about $38), 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 $138 a year.
Sizing at 9.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 576 | 24,000 | 70 lb |
| 2 | 1,152 | 24,000 | 140 lb |
| 4 | 2,304 | 24,000 | 280 lb |
| 6 | 3,456 | 32,000 | 420 lb |
Gooding County against the rest of Idaho
Among the 44 Idaho counties with data, Gooding County is number 21 of 44 counting from the hardest. Across the whole country it is harder than 49% of counties.
Softest in Idaho: Valley County at 1.3 gpg. Hardest: Caribou County at 23 gpg. Closest to Gooding County: Madison County (9.9), Butte County (10.2), Blaine County (10.3).