How hard is the water in Yuma County, CO?
10.5 grains per gallon
A softener is worth it here.
The median hardness measured in Yuma County, CO is 179 mg/L as calcium carbonate, which is 10.5 gpg. That is hard on the USGS scale. It comes from 594 samples at 44 sites between 1990 and 2024, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 8.8 and 11.6 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 10.5 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 Yuma 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 6.0 to 15.7 gpg
The softest single sample on record in Yuma County was 103 mg/L and the hardest 268 mg/L, a 3-fold gap. The top quarter of sites read above 11.6 gpg and the bottom quarter below 8.8 gpg.
Wells 8.6 gpg, rivers and lakes 10.5 gpg
1 groundwater samples from 1 wells put the median at 147 mg/L. 586 surface samples from 42 sites put it at 179 mg/L. In Yuma County the rivers and lakes come out 1.9 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 228 lb of salt a year (6 bags of 40 lb, about $41), 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 $141 a year.
Sizing at 10.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 630 | 24,000 | 77 lb |
| 2 | 1,260 | 24,000 | 153 lb |
| 4 | 2,520 | 24,000 | 307 lb |
| 6 | 3,780 | 32,000 | 460 lb |
Yuma County against the rest of Colorado
Among the 63 Colorado counties with data, Yuma County is number 33 of 63 counting from the hardest. Across the whole country it is harder than 53% of counties.
Softest in Colorado: Larimer County at 0.4 gpg. Hardest: Mesa County at 143.7 gpg. Closest to Yuma County: Broomfield County (9.9), San Miguel County (11.1), Park County (9.4).