Hardness
Hard
173 PPM · 10.1 GPG
Local water dashboard
Official source aggregationWater quality in Marlin, TX 76661
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Falls County.
1 active health-based violation
- Primary matched system
- City Of Marlin
- Source water
- Surface water
- County
- Falls 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 mg/L
0% of action level
Utility match
1 system
Serves 5,967 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
173 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
173
mg/L as CaCO₃ equivalent
Grains per gallon
10.1
1 GPG ≈ 17.1 PPM
What this means at home
At 173 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
45.8 mi
Observation range
Jan 28, 2016–Aug 26, 2020
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Navarro Mills Lk Site HF nr Dawson, TX (Lake, Reservoir, Impoundment).USGS source documentation ↗
Regional context
Is 76661 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Marlin median
173 PPM
About the same1 indexed ZIP readings · Range 173–173 PPM
Texas median
111 PPM
62 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 pass2 fail
Lead (PB90)
0 mg/L
Reported Dec 31, 2024
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
3 comparable results
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 0
EPA limit 0.015
Total Haloacetic Acids (HAA5)
Measured in MG/L
Local 0.062
EPA limit 0.06
TTHM
Measured in MG/L
Local 0.105
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 27
- Health-based
- 15
- Active health-based
- 1
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Total Haloacetic Acids (HAA5)Health-basedReported 0.062 MG/L · MCL 0.06 | TX0730002 | Unaddressed | Apr 1, 2026through Jun 30, 2026 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.153 MG/L · MCL 0.06 | TX0730002 | Archived | Jan 1, 2026through Mar 31, 2026 |
| TTHMHealth-basedReported 0.105 MG/L · MCL 0.08 | TX0730002 | Resolved | Jan 1, 2026through Mar 31, 2026 |
| TTHMHealth-basedReported 0.102 MG/L · MCL 0.08 | TX0730002 | Resolved | Oct 1, 2025through Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.143 MG/L · MCL 0.06 | TX0730002 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Public Notice | TX0730002 | Unaddressed | Aug 25, 2025 |
| Public Notice | TX0730002 | Unaddressed | Aug 25, 2025 |
| LEAD AND COPPER RULE REVISIONS | TX0730002 | Unaddressed | Jul 2, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.133 MG/L · MCL 0.06 | TX0730002 | Resolved | Jul 1, 2025through Sep 30, 2025 |
| Consumer Confidence Rule | TX0730002 | Unaddressed | Jul 1, 2025 |
| TTHMHealth-basedReported 0.106 MG/L · MCL 0.08 | TX0730002 | Resolved | Jul 1, 2025through Sep 30, 2025 |
| TTHMHealth-basedReported 0.109 MG/L · MCL 0.08 | TX0730002 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.135 MG/L · MCL 0.06 | TX0730002 | Resolved | Apr 1, 2025through Jun 30, 2025 |
| Public Notice | TX0730002 | Resolved | Feb 20, 2025through Jun 30, 2025 |
| Public Notice | TX0730002 | Resolved | Aug 24, 2024through Sep 24, 2024 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.082 MG/L · MCL 0.06 | TX0730002 | Archived | Jul 1, 2024through Sep 30, 2024 |
| Total Haloacetic Acids (HAA5) | TX0730002 | Resolved | Jun 3, 2024through Sep 5, 2024 |
| Public Notice | TX0730002 | Unaddressed | Apr 14, 2024 |
| Total Haloacetic Acids (HAA5)Health-basedReported 0.087 MG/L · MCL 0.06 | TX0730002 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.084 MG/L · MCL 0.08 | TX0730002 | Resolved | Apr 1, 2024through Jun 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 Marlin ZIP 76661 using 173 PPM nearby hardness and 3 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
173 PPM is 1× 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
Total Haloacetic Acids (HAA5), TTHM have 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 Marlin
Is tap water safe in Marlin?+
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 173 PPM, or 10.1 grains per gallon, classified as hard. This is not a household tap measurement.
Do I need a water softener?+
At 173 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.