How hard is the water in Hays County, TX?
18.2 grains per gallon
A softener will pay its way here.
The median hardness measured in Hays County, TX is 312 mg/L as calcium carbonate, which is 18.2 gpg. That is very hard on the USGS scale. It comes from 348 samples at 49 sites between 1990 and 2022, 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 17.3 and 22.8 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 18.2 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 14.1 to 234.5 gpg
The softest single sample on record in Hays County was 242 mg/L and the hardest 4,015 mg/L, a 17-fold gap. The top quarter of sites read above 22.8 gpg and the bottom quarter below 17.3 gpg.
Wells 18.2 gpg, rivers and lakes 15.2 gpg
348 groundwater samples from 49 wells put the median at 312 mg/L. 187 surface samples from 14 sites put it at 260.3 mg/L. In Hays County the wells come out 3.0 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, a 24,000-grain unit covers a week between regenerations. Expect about 398 lb of salt a year (10 bags of 40 lb, about $72), 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 $172 a year.
Sizing at 18.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,092 | 24,000 | 133 lb |
| 2 | 2,184 | 24,000 | 266 lb |
| 4 | 4,368 | 32,000 | 531 lb |
| 6 | 6,552 | 48,000 | 797 lb |
Hays County against the rest of Texas
Among the 217 Texas counties with data, Hays County is number 66 of 217 counting from the hardest. Across the whole country it is harder than 79% of counties.
Softest in Texas: Nacogdoches County at 0.3 gpg. Hardest: Ward County at 218.5 gpg. Closest to Hays County: Lampasas County (18.3), Hutchinson County (18.4), Kimble County (18).