How hard is the water in Mineral County, CO?
8.2 grains per gallon
A softener is worth it here.
The median hardness measured in Mineral County, CO is 141 mg/L as calcium carbonate, which is 8.2 gpg. That is hard on the USGS scale. It comes from 11 samples at 6 sites between 1990 and 2026, 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 2.6 and 13.5 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: medium (how it is measured).
What to do next
At 8.2 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 Mineral 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 1.1 to 19.9 gpg
The softest single sample on record in Mineral County was 19 mg/L and the hardest 340 mg/L, an 18-fold gap. The top quarter of sites read above 13.5 gpg and the bottom quarter below 2.6 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 8.2 gpg, rivers and lakes 1.6 gpg
11 groundwater samples from 6 wells put the median at 140.8 mg/L. 882 surface samples from 142 sites put it at 27.5 mg/L. In Mineral County the wells come out 6.6 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river 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 180 lb of salt a year (5 bags of 40 lb, about $32), 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 $132 a year.
Sizing at 8.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 492 | 24,000 | 60 lb |
| 2 | 984 | 24,000 | 120 lb |
| 4 | 1,968 | 24,000 | 239 lb |
| 6 | 2,952 | 24,000 | 359 lb |
Mineral County against the rest of Colorado
Among the 63 Colorado counties with data, Mineral County is number 42 of 63 counting from the hardest. Across the whole country it is harder than 44% of counties.
Softest in Colorado: Larimer County at 0.4 gpg. Hardest: Mesa County at 143.7 gpg. Closest to Mineral County: La Plata County (8.4), Las Animas County (8.5), Lake County (7.7).