How hard is the water in Chaves County, NM?
116.2 grains per gallon
A softener will pay its way here.
The median hardness measured in Chaves County, NM is 1990 mg/L as calcium carbonate, which is 116.2 gpg. That is very hard on the USGS scale. It comes from 111 samples at 21 sites between 1990 and 2023, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 73 and 150.7 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 116.2 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 24.1 to 174.1 gpg
The softest single sample on record in Chaves County was 412 mg/L and the hardest 2,980 mg/L, a 7-fold gap. The top quarter of sites read above 150.7 gpg and the bottom quarter below 73 gpg.
Wells 34.3 gpg, rivers and lakes 121.8 gpg
3 groundwater samples from 3 wells put the median at 588 mg/L. 108 surface samples from 18 sites put it at 2085 mg/L. In Chaves County the rivers and lakes come out 87.5 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, the water is harder than a standard single tank handles in a week, so plan on a larger or twin-tank unit. Expect about 2,539 lb of salt a year (64 bags of 40 lb, about $457), 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 $557 a year.
Sizing at 116.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 6,972 | 64,000 | 848 lb |
| 2 | 13,944 | twin tank | 1,697 lb |
| 4 | 27,888 | twin tank | 3,393 lb |
| 6 | 41,832 | twin tank | 5,090 lb |
Chaves County against the rest of New Mexico
Among the 33 New Mexico counties with data, Chaves County is the hardest. Across the whole country it is harder than 99% of counties.
Softest in New Mexico: Rio Arriba County at 2.3 gpg. Closest to Chaves County: De Baca County (61.9), Guadalupe County (59.9), San Juan County (55.3).