Hardness
Very Hard
182 PPM · 10.6 GPG
Local water dashboard
Official source aggregationWater quality in San Antonio, TX 78249
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Bexar County.
No active health-based violation reported
- Primary matched system
- San Antonio Water System
- Source water
- Surface water
- County
- Bexar County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
0.0016 mg/L
11% of action level
Utility match
1 system
Serves 2,643,729 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
182 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
182
mg/L as CaCO₃ equivalent
Grains per gallon
10.6
1 GPG ≈ 17.1 PPM
What this means at home
At 182 PPM, mineral scale can build up on fixtures and heating elements, reduce soap lather, and leave visible spotting. Hardness is primarily an aesthetic and appliance concern—not itself a tap-water safety rating.
USGS sites used
29
Nearest site
2.1 mi
Observation range
Jan 21, 2016–Jun 20, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Leon Ck at IH 10 and Loop 1604 nr San Antonio, TX (Stream).USGS source documentation ↗
Regional context
Is 78249 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
San Antonio median
178 PPM
About the same57 indexed ZIP readings · Range 174–182 PPM
Texas median
111 PPM
71 PPM higher1019 indexed ZIP readings · Range 5.4–500.5 PPM
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass
Lead (PB90)
0.0016 mg/L
Reported Dec 31, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.0016
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 0
- Health-based
- 0
- Active health-based
- 0
No violation record was returned for the associated systems in the imported lookback window beginning Jan 1, 2021.
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to San Antonio ZIP 78249 using 182 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
182 PPM is 2× the high-hardness trigger used by this matcher.
Designed to reduce scale on fixtures, water heaters, glassware, and plumbing throughout the home.
Compare whole-house systemsAffiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Nearby indexed reports
Compare ZIPs in San Antonio
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for San Antonio
Is tap water safe in San Antonio?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
Nearby USGS observations produce an estimate of 182 PPM, or 10.6 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 182 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.