Water Hardness in 78253
San Antonio, Texas · Bexar County
Dataset updated March 9, 2026Matched to 15 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 15 matched water systems. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.
Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.
Water Systems Serving 78253
These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
San Antonio Water System TX0150018 | surface water | 300 PPM Very HardUSGS estimate: 295 PPM | |
Jbsa - Sam Houston TX0150116 | groundwater | 300 PPM Very HardUSGS estimate: 305 PPM | |
City Of Converse TX0150047 | surface water | 300 PPM Very HardUSGS estimate: 239 PPM | |
East Central Sud TX0150138 | surface water | 300 PPM Very HardUSGS estimate: 307 PPM | |
Jbsa - Lackland TX0150114 | groundwater | 300 PPM Very HardUSGS estimate: 305 PPM |
Nearby Zip Codes
What This Means For You
Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Very Hard Water - Treatment Strongly Recommended
Your water is very hard. Without treatment, you can expect significant scale buildup in pipes and appliances, higher energy bills from reduced water heater efficiency, and persistent issues with skin and hair dryness.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | How to Test Your Water
Know your water hardness?
If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for San Antonio, TX (78253).
Frequently Asked Questions
Is the water hard in San Antonio, TX (78253)?
The average water hardness in 78253 is 300 PPM (17.5 GPG), which is classified as very hard.
Do I need a water softener in 78253?
With hardness of 300 PPM, a water softener is recommended for homes in 78253.
Is hard water in 78253 safe to drink?
Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.
How many water systems serve 78253?
Zip code 78253 in San Antonio, Texas is served by 15 water systems.
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