How hard is the water in Starr County, TX?

23.3 grains per gallon

A softener will pay its way here.

The median hardness measured in Starr County, TX is 399 mg/L as calcium carbonate, which is 23.3 gpg. That is very hard on the USGS scale. It comes from 318 samples at 7 sites between 1990 and 2005, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 16 and 75.9 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 23.3 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 14.5 to 89.4 gpg

The softest single sample on record in Starr County was 248 mg/L and the hardest 1,530 mg/L, a 6-fold gap. The top quarter of sites read above 75.9 gpg and the bottom quarter below 16 gpg.

What a softener would cost to run

For a household of 3, a 32,000-grain unit covers a week between regenerations. Expect about 508 lb of salt a year (13 bags of 40 lb, about $92), 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 $192 a year.

Sizing at 23.3 gpg

Starr County against the rest of Texas

Among the 217 Texas counties with data, Starr County is number 46 of 217 counting from the hardest. Across the whole country it is harder than 90% of counties.

Softest in Texas: Nacogdoches County at 0.3 gpg. Hardest: Ward County at 218.5 gpg. Closest to Starr County: Crosby County (23.5), Coleman County (23.8), Potter County (22.7).