How hard is the water in Millard County, UT?
18.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Millard County, UT is 314 mg/L as calcium carbonate, which is 18.3 gpg. That is very hard on the USGS scale. It comes from 420 samples at 104 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 11.7 and 36.7 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 18.3 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 2.0 to 136.8 gpg
The softest single sample on record in Millard County was 33.9 mg/L and the hardest 2,341 mg/L, a 69-fold gap. The top quarter of sites read above 36.7 gpg and the bottom quarter below 11.7 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 18.3 gpg, rivers and lakes 24.3 gpg
420 groundwater samples from 104 wells put the median at 314 mg/L. 637 surface samples from 38 sites put it at 415.8 mg/L. In Millard County the rivers and lakes come out 6.0 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 401 lb of salt a year (11 bags of 40 lb, about $72), 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 $172 a year.
Sizing at 18.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,098 | 24,000 | 134 lb |
| 2 | 2,196 | 24,000 | 267 lb |
| 4 | 4,392 | 32,000 | 534 lb |
| 6 | 6,588 | 48,000 | 802 lb |
Millard County against the rest of Utah
Among the 29 Utah counties with data, Millard County is number 11 of 29 counting from the hardest. Across the whole country it is harder than 80% of counties.
Softest in Utah: Davis County at 9 gpg. Hardest: Emery County at 151.3 gpg. Closest to Millard County: Morgan County (17.9), Sanpete County (18.9), Carbon County (19).