How hard is the water in Duchesne County, UT?
10.3 grains per gallon
A softener is worth it here.
The median hardness measured in Duchesne County, UT is 176 mg/L as calcium carbonate, which is 10.3 gpg. That is hard on the USGS scale. It comes from 117 samples at 36 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 2.7 and 17.9 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 10.3 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 Duchesne 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 0.2 to 55.3 gpg
The softest single sample on record in Duchesne County was 2.6 mg/L and the hardest 947 mg/L, a 364-fold gap. The top quarter of sites read above 17.9 gpg and the bottom quarter below 2.7 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 10.3 gpg, rivers and lakes 13 gpg
117 groundwater samples from 36 wells put the median at 176 mg/L. 2,855 surface samples from 149 sites put it at 221.7 mg/L. In Duchesne County the rivers and lakes come out 2.7 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 225 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 10.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 618 | 24,000 | 75 lb |
| 2 | 1,236 | 24,000 | 150 lb |
| 4 | 2,472 | 24,000 | 301 lb |
| 6 | 3,708 | 32,000 | 451 lb |
Duchesne County against the rest of Utah
Among the 29 Utah counties with data, Duchesne County is number 26 of 29 counting from the hardest. Across the whole country it is harder than 52% of counties.
Softest in Utah: Davis County at 9 gpg. Hardest: Emery County at 151.3 gpg. Closest to Duchesne County: Garfield County (9.5), Piute County (9.1), Davis County (9).