How hard is the water in Pueblo County, CO?
28 grains per gallon
A softener will pay its way here.
The median hardness measured in Pueblo County, CO is 479 mg/L as calcium carbonate, which is 28 gpg. That is very hard on the USGS scale. It comes from 85 samples at 32 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 8.9 and 50.1 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 28 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 Pueblo 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 4.0 to 249.4 gpg
The softest single sample on record in Pueblo County was 68.4 mg/L and the hardest 4,270 mg/L, a 62-fold gap. The top quarter of sites read above 50.1 gpg and the bottom quarter below 8.9 gpg.
Wells 28 gpg, rivers and lakes 19.1 gpg
85 groundwater samples from 32 wells put the median at 479 mg/L. 2,789 surface samples from 171 sites put it at 327 mg/L. In Pueblo County the wells come out 8.9 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. 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 40,000-grain unit covers a week between regenerations. Expect about 611 lb of salt a year (16 bags of 40 lb, about $110), 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 $210 a year.
Sizing at 28 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,680 | 24,000 | 204 lb |
| 2 | 3,360 | 24,000 | 409 lb |
| 4 | 6,720 | 48,000 | 818 lb |
| 6 | 10,080 | 80,000 | 1,226 lb |
Pueblo County against the rest of Colorado
Among the 63 Colorado counties with data, Pueblo County is number 10 of 63 counting from the hardest. Across the whole country it is harder than 94% of counties.
Softest in Colorado: Larimer County at 0.4 gpg. Hardest: Mesa County at 143.7 gpg. Closest to Pueblo County: Garfield County (26.6), Weld County (31.1), Denver County (24.2).