How hard is the water in Delta County, CO?
116.8 grains per gallon
A softener will pay its way here.
The median hardness measured in Delta County, CO is 2000 mg/L as calcium carbonate, which is 116.8 gpg. That is very hard on the USGS scale. It comes from 41 samples at 23 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 60.4 and 141.4 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: high (how it is measured).
What to do next
At 116.8 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.
More on sizing a softener for your household.
From 16.9 to 239.5 gpg
The softest single sample on record in Delta County was 290 mg/L and the hardest 4,100 mg/L, a 14-fold gap. The top quarter of sites read above 141.4 gpg and the bottom quarter below 60.4 gpg.
Wells 116.8 gpg, rivers and lakes 31.8 gpg
41 groundwater samples from 23 wells put the median at 2000 mg/L. 4,518 surface samples from 263 sites put it at 545 mg/L. In Delta County the wells come out 85.0 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, the water is harder than a standard single tank handles in a week, so plan on a larger or twin-tank unit. Expect about 2,552 lb of salt a year (64 bags of 40 lb, about $459), 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 $559 a year.
Sizing at 116.8 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 7,008 | 64,000 | 853 lb |
| 2 | 14,016 | twin tank | 1,705 lb |
| 4 | 28,032 | twin tank | 3,411 lb |
| 6 | 42,048 | twin tank | 5,116 lb |
Delta County against the rest of Colorado
Among the 63 Colorado counties with data, Delta County is number 2 of 63 counting from the hardest. Across the whole country it is harder than 100% of counties.
Softest in Colorado: Larimer County at 0.4 gpg. Hardest: Mesa County at 143.7 gpg. Closest to Delta County: Montrose County (115.4), Mesa County (143.7), Kiowa County (43.5).