Hardness
Very Hard
206 PPM · 12 GPG
Local water dashboard
Official source aggregationWater quality in Grandfield, OK 73546
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Tillman County.
1 reported benchmark flag
- Primary matched system
- Grandfield
- Source water
- Surface water
- County
- Tillman 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 1,110 people system-wide
Hardness meter
How hard is the water?
Estimated local hardness
USGS hardness classification scale
206 PPM
Soft
0–59Moderate
60–120Hard
121–180Very hard
181+
0–59Moderate
60–120Hard
121–180Very hard
181+
Parts per million
206
mg/L as CaCO₃ equivalent
Grains per gallon
12
1 GPG ≈ 17.1 PPM
What this means at home
At 206 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
7
Nearest site
22.9 mi
Observation range
Jan 20, 2016–Jun 3, 2026
Estimate confidence
Moderate
Median of the latest qualifying hardness observation at each nearby monitoring site. Nearest monitoring location: Unnamed Ck at FM 171, Wichita Falls, TX (Stream).USGS source documentation ↗
Regional context
Is 73546 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Grandfield median
206 PPM
About the same1 indexed ZIP readings · Range 206–206 PPM
Oklahoma median
226 PPM
20 PPM lower148 indexed ZIP readings · Range 7–610 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 mg/L
Reported Dec 31, 2025
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
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
- 33
- Health-based
- 28
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Nitrate-NitriteHealth-basedReported 12 MG/L | OK2007103 | Archived | Jan 1, 2026through Mar 31, 2026 |
| Nitrate-NitriteHealth-basedReported 12 MG/L | OK2007103 | Archived | Oct 1, 2025through Dec 31, 2025 |
| Nitrate-NitriteHealth-basedReported 12 MG/L | OK2007103 | Archived | Jul 1, 2025through Sep 30, 2025 |
| Nitrate-NitriteHealth-basedReported 12 MG/L | OK2007103 | Archived | Apr 1, 2025through Jun 30, 2025 |
| Nitrate-NitriteHealth-basedReported 14 MG/L | OK2007103 | Archived | Jan 1, 2025through Mar 31, 2025 |
| Nitrate-NitriteHealth-basedReported 11 MG/L | OK2007103 | Archived | Oct 1, 2024through Dec 31, 2024 |
| Nitrate-NitriteHealth-basedReported 13 MG/L | OK2007103 | Archived | Jul 1, 2024through Sep 30, 2024 |
| Nitrate-NitriteHealth-basedReported 11 MG/L | OK2007103 | Archived | Apr 1, 2024through Jun 30, 2024 |
| TTHMHealth-basedReported 0.086 MG/L · MCL 0.08 | OK2007103 | Archived | Jan 1, 2024through Mar 31, 2024 |
| TTHM | OK2007103 | Resolved | Dec 30, 2023through Mar 19, 2024 |
| TTHMHealth-basedReported 0.113 MG/L · MCL 0.08 | OK2007103 | Archived | Oct 1, 2023through Dec 31, 2023 |
| TTHM | OK2007103 | Resolved | Sep 29, 2023through Mar 19, 2024 |
| TTHMHealth-basedReported 0.135 MG/L · MCL 0.08 | OK2007103 | Archived | Jul 1, 2023through Sep 30, 2023 |
| TTHM | OK2007103 | Resolved | Jun 30, 2023through Sep 14, 2023 |
| Nitrate-NitriteHealth-basedReported 13 MG/L | OK2007103 | Resolved | Apr 1, 2023through Jun 30, 2023 |
| TTHM | OK2007103 | Resolved | Apr 1, 2023through Jul 3, 2023 |
| TTHMHealth-basedReported 0.151 MG/L · MCL 0.08 | OK2007103 | Archived | Apr 1, 2023through Jun 30, 2023 |
| Nitrate-NitriteHealth-basedReported 16 MG/L | OK2007103 | Resolved | Jan 1, 2023through Mar 31, 2023 |
| TTHMHealth-basedReported 0.128 MG/L · MCL 0.08 | OK2007103 | Archived | Jan 1, 2023through Mar 31, 2023 |
| TTHM | OK2007103 | Resolved | Dec 30, 2022through Jul 3, 2023 |
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 Grandfield ZIP 73546 using 206 PPM nearby hardness and 2 reported measurement benchmarks.
Scale protection
High-Capacity Whole House Water Softener
206 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 Grandfield
Is tap water safe in Grandfield?+
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 206 PPM, or 12 grains per gallon, classified as very hard. This is not a household tap measurement.
Do I need a water softener?+
At 206 PPM, a correctly sized whole-house softener can reduce scale and hard-water spotting. It does not replace contaminant filtration.