How hard is the water in Sanpete County, UT?
18.9 grains per gallon
A softener will pay its way here.
The median hardness measured in Sanpete County, UT is 324 mg/L as calcium carbonate, which is 18.9 gpg. That is very hard on the USGS scale. It comes from 80 samples at 28 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 17.3 and 21.6 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 18.9 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 13.5 to 41.8 gpg
The softest single sample on record in Sanpete County was 231 mg/L and the hardest 715 mg/L, a 3-fold gap. The top quarter of sites read above 21.6 gpg and the bottom quarter below 17.3 gpg.
Wells 18.9 gpg, rivers and lakes 16 gpg
80 groundwater samples from 28 wells put the median at 323.5 mg/L. 1,602 surface samples from 72 sites put it at 273.7 mg/L. In Sanpete County the wells come out 2.9 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. 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 413 lb of salt a year (11 bags of 40 lb, about $74), 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 $174 a year.
Sizing at 18.9 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,134 | 24,000 | 138 lb |
| 2 | 2,268 | 24,000 | 276 lb |
| 4 | 4,536 | 32,000 | 552 lb |
| 6 | 6,804 | 48,000 | 828 lb |
Sanpete County against the rest of Utah
Among the 29 Utah counties with data, Sanpete County is number 10 of 29 counting from the hardest. Across the whole country it is harder than 81% of counties.
Softest in Utah: Davis County at 9 gpg. Hardest: Emery County at 151.3 gpg. Closest to Sanpete County: Carbon County (19), Millard County (18.3), Tooele County (19.5).