Hardness
Very Hard
368 PPM · 21.5 GPG
Local water dashboard
Official source aggregationWater quality in San Angelo, TX 76905
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Tom Green County.
1 reported benchmark flag
- Primary matched system
- City Of San Angelo
- Source water
- Surface water
- County
- Tom Green 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
0.004 mg/L
26% of action level
Utility match
1 system
Serves 105,229 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
368 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
368
mg/L as CaCO₃ equivalent
Grains per gallon
21.5
1 GPG ≈ 17.1 PPM
What this means at home
At 368 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
8
Nearest site
24.7 mi
Observation range
May 30, 2017–Jul 13, 2017
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: YB-43-52-607 (Well).USGS source documentation ↗
Regional context
Is 76905 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
San Angelo median
324 PPM
44 PPM higher5 indexed ZIP readings · Range 301.5–368 PPM
Texas median
111 PPM
257 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 pass1 fail
Lead (PB90)
0.004 mg/L
Reported Dec 31, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
2 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0.004
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.086
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 6
- Health-based
- 2
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | TX2260001 | Resolved | Jul 2, 2025through Mar 27, 2026 |
| Consumer Confidence Rule | TX2260001 | Resolved | Jul 1, 2025through Feb 9, 2026 |
| Lead and Copper Rule | TX2260001 | Resolved | Dec 30, 2024through Feb 4, 2025 |
| TTHMHealth-basedReported 0.086 MG/L · MCL 0.08 | TX2260001 | Resolved | Oct 1, 2024through Dec 31, 2024 |
| Public Notice | TX2260001 | Resolved | Sep 22, 2024through Nov 21, 2024 |
| TTHMHealth-basedReported 0.083 MG/L · MCL 0.08 | TX2260001 | Resolved | Jul 1, 2024through Sep 30, 2024 |
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 Angelo ZIP 76905 using 368 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
368 PPM is 3× 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 systemsDrinking water protection
Under-Sink Reverse Osmosis System
TTHM has a measured benchmark flag or active health-based SDWIS record in this profile.
A certified multi-stage RO system targets a broader range of dissolved contaminants at the kitchen tap.
Explore under-sink filtrationAffiliate 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 Angelo
Estimates can differ across a city because monitoring locations and associated systems differ.
Frequently asked
Water questions for San Angelo
Is tap water safe in San Angelo?+
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 368 PPM, or 21.5 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 368 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.