How hard is the water in Grand County, UT?
17.5 grains per gallon
A softener will pay its way here.
The median hardness measured in Grand County, UT is 299 mg/L as calcium carbonate, which is 17.5 gpg. That is very hard on the USGS scale. It comes from 452 samples at 124 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 9.4 and 32.4 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 17.5 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. Because Grand 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 0.4 to 137.2 gpg
The softest single sample on record in Grand County was 6.5 mg/L and the hardest 2,348.8 mg/L, a 361-fold gap. The top quarter of sites read above 32.4 gpg and the bottom quarter below 9.4 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 17.5 gpg, rivers and lakes 20.6 gpg
452 groundwater samples from 124 wells put the median at 299.3 mg/L. 2,377 surface samples from 123 sites put it at 353 mg/L. In Grand County the rivers and lakes come out 3.1 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, a 24,000-grain unit covers a week between regenerations. Expect about 382 lb of salt a year (10 bags of 40 lb, about $69), 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 $169 a year.
Sizing at 17.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,050 | 24,000 | 128 lb |
| 2 | 2,100 | 24,000 | 256 lb |
| 4 | 4,200 | 32,000 | 511 lb |
| 6 | 6,300 | 48,000 | 767 lb |
Grand County against the rest of Utah
Among the 29 Utah counties with data, Grand County is number 13 of 29 counting from the hardest. Across the whole country it is harder than 77% of counties.
Softest in Utah: Davis County at 9 gpg. Hardest: Emery County at 151.3 gpg. Closest to Grand County: Morgan County (17.9), Utah County (16.8), Sevier County (16.6).