How hard is the water in Carbon County, UT?
19 grains per gallon
A softener will pay its way here.
The median hardness measured in Carbon County, UT is 326 mg/L as calcium carbonate, which is 19 gpg. That is very hard on the USGS scale. It comes from 76 samples at 25 sites between 1990 and 2015, 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 13.1 and 34 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: high (how it is measured).
What to do next
At 19 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 0.5 to 72.7 gpg
The softest single sample on record in Carbon County was 9.1 mg/L and the hardest 1,244.4 mg/L, a 137-fold gap. The top quarter of sites read above 34 gpg and the bottom quarter below 13.1 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 19 gpg, rivers and lakes 20.3 gpg
76 groundwater samples from 25 wells put the median at 326 mg/L. 869 surface samples from 75 sites put it at 347.4 mg/L. In Carbon County the rivers and lakes come out 1.3 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 416 lb of salt a year (11 bags of 40 lb, about $75), 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 $175 a year.
Sizing at 19 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,140 | 24,000 | 139 lb |
| 2 | 2,280 | 24,000 | 277 lb |
| 4 | 4,560 | 32,000 | 555 lb |
| 6 | 6,840 | 48,000 | 832 lb |
Carbon County against the rest of Utah
Among the 29 Utah counties with data, Carbon County is number 9 of 29 counting from the hardest. Across the whole country it is harder than 82% of counties.
Softest in Utah: Davis County at 9 gpg. Hardest: Emery County at 151.3 gpg. Closest to Carbon County: Sanpete County (18.9), Tooele County (19.5), San Juan County (19.6).