How hard is the water in Iron County, UT?
15.4 grains per gallon
A softener will pay its way here.
The median hardness measured in Iron County, UT is 264 mg/L as calcium carbonate, which is 15.4 gpg. That is very hard on the USGS scale. It comes from 650 samples at 213 sites between 1990 and 2021, 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 27.6 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 15.4 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 Iron 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 1.1 to 276.0 gpg
The softest single sample on record in Iron County was 18.1 mg/L and the hardest 4,724.6 mg/L, a 261-fold gap. The top quarter of sites read above 27.6 gpg and the bottom quarter below 9.4 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 15.4 gpg, rivers and lakes 8.3 gpg
650 groundwater samples from 213 wells put the median at 264 mg/L. 406 surface samples from 29 sites put it at 141.7 mg/L. In Iron County the wells come out 7.1 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 337 lb of salt a year (9 bags of 40 lb, about $61), 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 $161 a year.
Sizing at 15.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 924 | 24,000 | 112 lb |
| 2 | 1,848 | 24,000 | 225 lb |
| 4 | 3,696 | 32,000 | 450 lb |
| 6 | 5,544 | 40,000 | 675 lb |
Iron County against the rest of Utah
Among the 29 Utah counties with data, Iron County is number 18 of 29 counting from the hardest. Across the whole country it is harder than 71% of counties.
Softest in Utah: Davis County at 9 gpg. Hardest: Emery County at 151.3 gpg. Closest to Iron County: Cache County (15.5), Wasatch County (15.6), Washington County (15.1).