Hardness
Moderately Hard
84.2 PPM · 4.9 GPG
Local water dashboard
Official source aggregationWater quality in Port Lavaca, TX 77979
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Calhoun County.
1 active health-based violation
- Primary matched system
- City Of Port Lavaca
- Source water
- Surface water
- County
- Calhoun County
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
Review needed
1 active health-based record
Lead 90th percentile
0.0023 mg/L
15% of action level
Utility match
1 system
Serves 12,000 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
84.2 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
84.2
mg/L as CaCO₃ equivalent
Grains per gallon
4.9
1 GPG ≈ 17.1 PPM
What this means at home
At 84.2 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
1
Nearest site
19.9 mi
Observation range
Jan 28, 2016–Jun 9, 2026
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Lk Texana Site AC nr Edna, TX (Lake, Reservoir, Impoundment).USGS source documentation ↗
Regional context
Is 77979 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Port Lavaca median
84 PPM
About the same1 indexed ZIP readings · Range 84.2–84.2 PPM
Texas median
111 PPM
27 PPM lower1019 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)
0.0023 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 0.0023
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.117
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 24
- Health-based
- 17
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | TX0290002 | Unaddressed | May 4, 2026 |
| TTHMHealth-basedReported 0.117 MG/L · MCL 0.08 | TX0290002 | Unaddressed | Apr 1, 2026through Jun 30, 2026 |
| TTHMHealth-basedReported 0.112 MG/L · MCL 0.08 | TX0290002 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Public Notice | TX0290002 | Resolved | Oct 24, 2025through Dec 8, 2025 |
| TTHMHealth-basedReported 0.108 MG/L · MCL 0.08 | TX0290002 | Archived | Oct 1, 2025through Dec 31, 2025 |
| LEAD AND COPPER RULE REVISIONS | TX0290002 | Resolved | Jul 2, 2025through Apr 20, 2026 |
| TTHMHealth-basedReported 0.107 MG/L · MCL 0.08 | TX0290002 | Archived | Jul 1, 2025through Sep 30, 2025 |
| TTHMHealth-basedReported 0.107 MG/L · MCL 0.08 | TX0290002 | Archived | Apr 1, 2025through Jun 30, 2025 |
| TTHMHealth-basedReported 0.101 MG/L · MCL 0.08 | TX0290002 | Archived | Jan 1, 2025through Mar 31, 2025 |
| Lead and Copper Rule | TX0290002 | Resolved | Dec 30, 2024through Feb 4, 2025 |
| TTHMHealth-basedReported 0.1 MG/L · MCL 0.08 | TX0290002 | Archived | Oct 1, 2024through Dec 31, 2024 |
| TTHMHealth-basedReported 0.12 MG/L · MCL 0.08 | TX0290002 | Archived | Jul 1, 2024through Sep 30, 2024 |
| TTHMHealth-basedReported 0.117 MG/L · MCL 0.08 | TX0290002 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.125 MG/L · MCL 0.08 | TX0290002 | Archived | Jan 1, 2024through Mar 31, 2024 |
| TTHMHealth-basedReported 0.13 MG/L · MCL 0.08 | TX0290002 | Archived | Oct 1, 2023through Dec 31, 2023 |
| TTHMHealth-basedReported 0.096 MG/L · MCL 0.08 | TX0290002 | Archived | Jul 1, 2023through Sep 30, 2023 |
| Public Notice | TX0290002 | Resolved | May 9, 2023through May 11, 2023 |
| TTHMHealth-basedReported 0.097 MG/L · MCL 0.08 | TX0290002 | Archived | Apr 1, 2023through Jun 30, 2023 |
| TTHMHealth-basedReported 0.093 MG/L · MCL 0.08 | TX0290002 | Archived | Jan 1, 2023through Mar 31, 2023 |
| TTHMHealth-basedReported 0.084 MG/L · MCL 0.08 | TX0290002 | Resolved | Jul 1, 2021through Sep 30, 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 Port Lavaca ZIP 77979 using 84.2 PPM nearby hardness and 2 reported measurement benchmarks.
Drinking 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.
Frequently asked
Water questions for Port Lavaca
Is tap water safe in Port Lavaca?+
EPA ECHO reports 1 active health-based violation among the associated community water systems. Review the affected utility's current notice and Consumer Confidence Report.
How hard is the water?+
Nearby USGS observations produce an estimate of 84.2 PPM, or 4.9 grains per gallon, classified as moderately hard. This is not a household tap measurement.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.