How hard is the water in Prowers County, CO?
5.3 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Prowers County, CO is 90 mg/L as calcium carbonate, which is 5.3 gpg. That is moderately hard on the USGS scale. It comes from 17 samples at 5 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 5.3 and 6.4 gpg. The whole middle of that range gives the same answer, so a test of your own tap is unlikely to change it. Confidence in the county figure: medium (how it is measured).
What to do next
At 5.3 gpg this is your call. Look for white film on glasses and crust on the shower head: if you see little of either, you can live without one. If you do want one, a 24,000-grain unit is enough, so ask for that size rather than a bigger one.
More on when a softener is not worth it.
From 3.8 to 13.5 gpg
The softest single sample on record in Prowers County was 65.8 mg/L and the hardest 230.5 mg/L, a 4-fold gap. The top quarter of sites read above 6.4 gpg and the bottom quarter below 5.3 gpg.
Wells 5.3 gpg, rivers and lakes 71.8 gpg
17 groundwater samples from 5 wells put the median at 90 mg/L. 552 surface samples from 62 sites put it at 1229 mg/L. In Prowers County the rivers and lakes come out 66.5 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 115 lb of salt a year (3 bags of 40 lb, about $21), 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 $121 a year.
Sizing at 5.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 318 | 24,000 | 39 lb |
| 2 | 636 | 24,000 | 77 lb |
| 4 | 1,272 | 24,000 | 155 lb |
| 6 | 1,908 | 24,000 | 232 lb |
Prowers County against the rest of Colorado
Among the 63 Colorado counties with data, Prowers County is number 55 of 63 counting from the hardest. Across the whole country it is harder than 32% of counties.
Softest in Colorado: Larimer County at 0.4 gpg. Hardest: Mesa County at 143.7 gpg. Closest to Prowers County: Bent County (5.6), Costilla County (4.9), Archuleta County (5.8).