How hard is the water in Guadalupe County, TX?
16.5 grains per gallon
A softener will pay its way here.
The median hardness measured in Guadalupe County, TX is 283 mg/L as calcium carbonate, which is 16.5 gpg. That is very hard on the USGS scale. It comes from 12 samples at 5 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 8.9 and 16.9 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: medium (how it is measured).
What to do next
At 16.5 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. Because Guadalupe 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 1.4 to 27.2 gpg
The softest single sample on record in Guadalupe County was 24.4 mg/L and the hardest 465 mg/L, a 19-fold gap. The top quarter of sites read above 16.9 gpg and the bottom quarter below 8.9 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 16.5 gpg, rivers and lakes 15 gpg
12 groundwater samples from 5 wells put the median at 282.5 mg/L. 58 surface samples from 8 sites put it at 256.8 mg/L. In Guadalupe County the wells come out 1.5 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 360 lb of salt a year (10 bags of 40 lb, about $65), 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 $165 a year.
Sizing at 16.5 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 990 | 24,000 | 120 lb |
| 2 | 1,980 | 24,000 | 241 lb |
| 4 | 3,960 | 32,000 | 482 lb |
| 6 | 5,940 | 48,000 | 723 lb |
Guadalupe County against the rest of Texas
Among the 217 Texas counties with data, Guadalupe County is number 78 of 217 counting from the hardest. Across the whole country it is harder than 74% of counties.
Softest in Texas: Nacogdoches County at 0.3 gpg. Hardest: Ward County at 218.5 gpg. Closest to Guadalupe County: Culberson County (16.5), Parker County (16.5), Bexar County (16.5).