San Antonio, TX water hardness

San Antonio's tap water measures 299 ppm, which is very hard. The number comes from San Antonio Water System's 2025 published data, measured at the tap.

Score

299 ppm

Very hard

San Antonio shower water

Hardness bands per the U.S. Geological Survey. Range: 257 to 342 ppm across service areas.

299

Soft
0–60

Moderately hard
61–120

Hard
121–180

Very hard
181+

Source: San Antonio Water System, 2025.

Verified August 2026 against the utility's published figures.

Elsewhere in Texas, El Paso tests at 175 ppm and Austin at 93 ppm.

What this means

What San Antonio Water Means for Hair and Skin

Above 180 ppm, minerals leave visible scale on fixtures, soap struggles to lather, and hair and skin carry a film that rinsing doesn't remove. This is the range where people notice hard water without being told.

What removes it

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Water tests soft on a standard hardness strip

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Check the number for your exact address with the free zip lookup, or read the utility's own report linked above.

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