How hard is the water in Kerr County, TX?
20.4 grains per gallon
A softener will pay its way here.
The median hardness measured in Kerr County, TX is 349 mg/L as calcium carbonate, which is 20.4 gpg. That is very hard on the USGS scale. It comes from 13 samples at 13 sites between 1990 and 2017, 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 18.6 and 25.6 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: medium (how it is measured).
What to do next
At 20.4 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 15.7 to 39.2 gpg
The softest single sample on record in Kerr County was 268 mg/L and the hardest 671 mg/L, a 3-fold gap. The top quarter of sites read above 25.6 gpg and the bottom quarter below 18.6 gpg.
Wells 20.4 gpg, rivers and lakes 13.7 gpg
13 groundwater samples from 13 wells put the median at 349 mg/L. 10 surface samples from 5 sites put it at 234.5 mg/L. In Kerr County the wells come out 6.7 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 32,000-grain unit covers a week between regenerations. Expect about 445 lb of salt a year (12 bags of 40 lb, about $80), 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 $180 a year.
Sizing at 20.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,224 | 24,000 | 149 lb |
| 2 | 2,448 | 24,000 | 298 lb |
| 4 | 4,896 | 40,000 | 596 lb |
| 6 | 7,344 | 64,000 | 894 lb |
Kerr County against the rest of Texas
Among the 217 Texas counties with data, Kerr County is number 56 of 217 counting from the hardest. Across the whole country it is harder than 85% of counties.
Softest in Texas: Nacogdoches County at 0.3 gpg. Hardest: Ward County at 218.5 gpg. Closest to Kerr County: Somervell County (20.3), Cameron County (20.2), Jones County (20.2).