How hard is the water in Carbon County, WY?
12.9 grains per gallon
A softener will pay its way here.
The median hardness measured in Carbon County, WY is 220 mg/L as calcium carbonate, which is 12.9 gpg. That is very hard on the USGS scale. It comes from 83 samples at 69 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 8.1 and 42.8 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 12.9 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. Because Carbon 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 0.5 to 289.2 gpg
The softest single sample on record in Carbon County was 8.8 mg/L and the hardest 4,950 mg/L, a 563-fold gap. The top quarter of sites read above 42.8 gpg and the bottom quarter below 8.1 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 12.9 gpg, rivers and lakes 13.3 gpg
83 groundwater samples from 69 wells put the median at 220 mg/L. 975 surface samples from 34 sites put it at 228 mg/L. In Carbon County the rivers and lakes come out 0.4 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 281 lb of salt a year (8 bags of 40 lb, about $51), 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 $151 a year.
Sizing at 12.9 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 774 | 24,000 | 94 lb |
| 2 | 1,548 | 24,000 | 188 lb |
| 4 | 3,096 | 24,000 | 377 lb |
| 6 | 4,644 | 40,000 | 565 lb |
Carbon County against the rest of Wyoming
Among the 23 Wyoming counties with data, Carbon County is number 12 of 23 counting from the hardest. Across the whole country it is harder than 61% of counties.
Softest in Wyoming: Park County at 1.4 gpg. Hardest: Natrona County at 124.4 gpg. Closest to Carbon County: Lincoln County (13.8), Converse County (11.8), Sweetwater County (14.3).