Hardness
Very Hard
187 PPM · 10.9 GPG
Local water dashboard
Official source aggregationWater quality in Montgomery, TX 77356
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Montgomery County.
1 reported benchmark flag
- Primary matched system
- City Of Montgomery
- Source water
- Groundwater
- County
- Montgomery 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
6.3e-4 mg/L
4% of action level
Utility match
1 system
Serves 3,771 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
187 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
187
mg/L as CaCO₃ equivalent
Grains per gallon
10.9
1 GPG ≈ 17.1 PPM
What this means at home
At 187 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
52
Nearest site
4.8 mi
Observation range
Feb 17, 2016–Jun 12, 2025
Estimate confidence
Moderate
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 77356 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Montgomery median
187 PPM
About the same1 indexed ZIP readings · Range 187–187 PPM
Texas median
111 PPM
76 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)
6.3e-4 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 6.3e-4
EPA limit 0.015
TTHM
Measured in MG/L
Local 0.082
EPA limit 0.08
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 14
- Health-based
- 1
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Public Notice | TX1700022 | Resolved | Jul 24, 2023through Jul 28, 2023 |
| TTHMHealth-basedReported 0.082 MG/L · MCL 0.08 | TX1700022 | Resolved | Apr 1, 2023through Jun 30, 2023 |
| ETHYLENE DIBROMIDE | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| 2,4,5-TP | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| OXAMYL | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Dalapon | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Aldicarb sulfone | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| 2,4-D | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Dinoseb | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Aldicarb | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Carbofuran | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Aldicarb sulfoxide | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| Picloram | TX1700022 | Archived | Jan 1, 2022through Dec 31, 2024 |
| 1,2-DIBROMO-3-CHLOROPROPANE | TX1700022 | Archived | Jan 1, 2022through Dec 31, 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 Montgomery ZIP 77356 using 187 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
187 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 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.
Frequently asked
Water questions for Montgomery
Is tap water safe in Montgomery?+
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 187 PPM, or 10.9 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 187 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.