How hard is the water in Cooke County, TX?
6 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Cooke County, TX is 104 mg/L as calcium carbonate, which is 6 gpg. That is moderately hard on the USGS scale. It comes from 644 samples at 11 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 5.4 and 6.3 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 6 gpg this is your call. Look for white film on glasses and crust on the shower head: if you see little of either, you can live without one. If you do want one, a 24,000-grain unit is enough, so ask for that size rather than a bigger one.
More on when a softener is not worth it.
From 0.4 to 14.1 gpg
The softest single sample on record in Cooke County was 7 mg/L and the hardest 242 mg/L, a 35-fold gap. The top quarter of sites read above 6.3 gpg and the bottom quarter below 5.4 gpg.
Wells 0.4 gpg, rivers and lakes 6.1 gpg
1 groundwater samples from 1 wells put the median at 7 mg/L. 643 surface samples from 10 sites put it at 103.8 mg/L. In Cooke County the rivers and lakes come out 5.7 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 132 lb of salt a year (4 bags of 40 lb, about $24), 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 $124 a year.
Sizing at 6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 360 | 24,000 | 44 lb |
| 2 | 720 | 24,000 | 88 lb |
| 4 | 1,440 | 24,000 | 175 lb |
| 6 | 2,160 | 24,000 | 263 lb |
Cooke County against the rest of Texas
Among the 217 Texas counties with data, Cooke County is number 170 of 217 counting from the hardest. Across the whole country it is harder than 35% of counties.
Softest in Texas: Nacogdoches County at 0.3 gpg. Hardest: Ward County at 218.5 gpg. Closest to Cooke County: Jackson County (6.1), Kenedy County (6), Liberty County (6).