How hard is the water in Platte County, WY?
14.4 grains per gallon
A softener will pay its way here.
The median hardness measured in Platte County, WY is 246 mg/L as calcium carbonate, which is 14.4 gpg. That is very hard on the USGS scale. It comes from 39 samples at 39 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 9.6 and 20.9 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 14.4 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 Platte 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 33.2 gpg
The softest single sample on record in Platte County was 8.4 mg/L and the hardest 568 mg/L, a 68-fold gap. The top quarter of sites read above 20.9 gpg and the bottom quarter below 9.6 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 14.4 gpg, rivers and lakes 24.9 gpg
39 groundwater samples from 39 wells put the median at 246 mg/L. 1 surface samples from 1 sites put it at 426 mg/L. In Platte County the rivers and lakes come out 10.5 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 314 lb of salt a year (8 bags of 40 lb, about $56), 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 $156 a year.
Sizing at 14.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 864 | 24,000 | 105 lb |
| 2 | 1,728 | 24,000 | 210 lb |
| 4 | 3,456 | 32,000 | 420 lb |
| 6 | 5,184 | 40,000 | 631 lb |
Platte County against the rest of Wyoming
Among the 23 Wyoming counties with data, Platte County is number 9 of 23 counting from the hardest. Across the whole country it is harder than 67% of counties.
Softest in Wyoming: Park County at 1.4 gpg. Hardest: Natrona County at 124.4 gpg. Closest to Platte County: Sweetwater County (14.3), Uinta County (14.5), Lincoln County (13.8).