How hard is the water in El Paso County, TX?
8.6 grains per gallon
A softener is worth it here.
The median hardness measured in El Paso County, TX is 148 mg/L as calcium carbonate, which is 8.6 gpg. That is hard on the USGS scale. It comes from 221 samples at 111 sites between 1990 and 2023, 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 6.4 and 11.9 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 8.6 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 El Paso 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 0.4 to 40.8 gpg
The softest single sample on record in El Paso County was 6.7 mg/L and the hardest 699 mg/L, a 104-fold gap. The top quarter of sites read above 11.9 gpg and the bottom quarter below 6.4 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 8.6 gpg, rivers and lakes 22.5 gpg
221 groundwater samples from 111 wells put the median at 148 mg/L. 421 surface samples from 24 sites put it at 385 mg/L. In El Paso County the rivers and lakes come out 13.9 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 189 lb of salt a year (5 bags of 40 lb, about $34), 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 $134 a year.
Sizing at 8.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 516 | 24,000 | 63 lb |
| 2 | 1,032 | 24,000 | 126 lb |
| 4 | 2,064 | 24,000 | 251 lb |
| 6 | 3,096 | 24,000 | 377 lb |
El Paso County against the rest of Texas
Among the 217 Texas counties with data, El Paso County is number 144 of 217 counting from the hardest. Across the whole country it is harder than 45% of counties.
Softest in Texas: Nacogdoches County at 0.3 gpg. Hardest: Ward County at 218.5 gpg. Closest to El Paso County: Brazoria County (8.6), Fort Bend County (8.5), McLennan County (8.8).