Hardness
Hard
166 PPM · 9.7 GPG
Local water dashboard
Official source aggregationWater quality in Madisonville, TX 77864
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Madison County.
No active health-based violation reported
- Primary matched system
- City Of Madisonville
- Source water
- Groundwater
- County
- Madison 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 mg/L
0% of action level
Utility match
1 system
Serves 6,111 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
166 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
166
mg/L as CaCO₃ equivalent
Grains per gallon
9.7
1 GPG ≈ 17.1 PPM
What this means at home
At 166 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
34
Nearest site
37.3 mi
Observation range
Feb 17, 2016–Jun 12, 2025
Estimate confidence
Low
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: TS-60-35-303 (Well).USGS source documentation ↗
Regional context
Is 77864 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Madisonville median
166 PPM
About the same1 indexed ZIP readings · Range 166–166 PPM
Texas median
111 PPM
55 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 mg/L
Reported Dec 31, 2025
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
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 3
- Health-based
- 0
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| LEAD AND COPPER RULE REVISIONS | TX1570001 | Resolved | Jul 2, 2025through Mar 27, 2026 |
| Consumer Confidence Rule | TX1570001 | Resolved | Jul 2, 2024through Oct 7, 2024 |
| E. COLI | TX1570001 | Unaddressed | Nov 1, 2010 |
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 Madisonville ZIP 77864 using 166 PPM nearby hardness and 1 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
166 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 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.
Frequently asked
Water questions for Madisonville
Is tap water safe in Madisonville?+
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 166 PPM, or 9.7 grains per gallon, classified as hard. This is not a household tap measurement.
Do I need a water softener?+
At 166 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.