Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Grandfield, OK 73546
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Tillman County.
Historical measurement record needs context
- Largest possible serving system
- Grandfield
- Source water
- Surface water
- County
- Tillman County
- Profile updated
Your tap water
What does the utility report?
Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.
Utility hardness unavailable in this index
Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.
Find an official utility report →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
1 system
Serves 1,110 people system-wide
Match the name on your water bill
Your utility’s measurements and compliance records
These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.
EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.
Grandfield
OK2007103 · Surface water · 1,110 people served system-wide
A municipal system, in-state city, and served county all agree with this Census ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →Measurements (2)
An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0 mg/L
- Action level
- 0.015 mg/L
0% of the listed benchmark
Monitoring period: Jan 1, 2023 to Dec 31, 2025
TTHM
EPA SDWIS reported health-based violation
- Reported level
- 0.086 MG/L
- Maximum contaminant level
- 0.08 MG/L
108% of the listed benchmark
Monitoring period: Jan 1, 2024 to Mar 31, 2024
Violation history (33)
| Rule | Status | Period |
|---|---|---|
| Nitrate-NitriteHealth-based | Archived | Jan 1, 2026 to Mar 31, 2026 |
| Nitrate-NitriteHealth-based | Archived | Oct 1, 2025 to Dec 31, 2025 |
| Nitrate-NitriteHealth-based | Archived | Jul 1, 2025 to Sep 30, 2025 |
| Nitrate-NitriteHealth-based | Archived | Apr 1, 2025 to Jun 30, 2025 |
| Nitrate-NitriteHealth-based | Archived | Jan 1, 2025 to Mar 31, 2025 |
| Nitrate-NitriteHealth-based | Archived | Oct 1, 2024 to Dec 31, 2024 |
| Nitrate-NitriteHealth-based | Archived | Jul 1, 2024 to Sep 30, 2024 |
| Nitrate-NitriteHealth-based | Archived | Apr 1, 2024 to Jun 30, 2024 |
| TTHMHealth-based | Archived | Jan 1, 2024 to Mar 31, 2024 |
| TTHM | Resolved | Dec 30, 2023 to Mar 19, 2024 |
| TTHMHealth-based | Archived | Oct 1, 2023 to Dec 31, 2023 |
| TTHM | Resolved | Sep 29, 2023 to Mar 19, 2024 |
| TTHMHealth-based | Archived | Jul 1, 2023 to Sep 30, 2023 |
| TTHM | Resolved | Jun 30, 2023 to Sep 14, 2023 |
| Nitrate-NitriteHealth-based | Resolved | Apr 1, 2023 to Jun 30, 2023 |
| TTHM | Resolved | Apr 1, 2023 to Jul 3, 2023 |
| TTHMHealth-based | Archived | Apr 1, 2023 to Jun 30, 2023 |
| Nitrate-NitriteHealth-based | Resolved | Jan 1, 2023 to Mar 31, 2023 |
| TTHMHealth-based | Archived | Jan 1, 2023 to Mar 31, 2023 |
| TTHM | Resolved | Dec 30, 2022 to Jul 3, 2023 |
| Nitrate-NitriteHealth-based | Resolved | Oct 1, 2022 to Dec 31, 2022 |
| TTHMHealth-based | Archived | Oct 1, 2022 to Dec 31, 2022 |
| Nitrate-NitriteHealth-based | Resolved | Jul 1, 2022 to Sep 30, 2022 |
| TTHMHealth-based | Archived | Jul 1, 2022 to Sep 30, 2022 |
| Nitrate-NitriteHealth-based | Resolved | Apr 1, 2022 to Jun 30, 2022 |
| Nitrate-NitriteHealth-based | Resolved | Jan 1, 2022 to Mar 31, 2022 |
| TTHMHealth-based | Archived | Jan 1, 2022 to Mar 31, 2022 |
| Nitrate-NitriteHealth-based | Resolved | Oct 1, 2021 to Dec 31, 2021 |
| Nitrate-NitriteHealth-based | Resolved | Jul 1, 2021 to Sep 30, 2021 |
| TTHMHealth-based | Archived | Apr 1, 2021 to Jun 30, 2021 |
| Nitrate-NitriteHealth-based | Resolved | Apr 1, 2021 to Jun 30, 2021 |
| Nitrate-NitriteHealth-based | Resolved | Jan 1, 2021 to Mar 31, 2021 |
| TTHMHealth-based | Archived | Jan 1, 2021 to Mar 31, 2021 |
Hardness meter
What does nearby environmental evidence show?
554.2
PPM as CaCO₃
Very Hard
PPM
554.2
GPG
32.4
Regional environmental evidence
USGS hardness classification scale
554.2 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
554.2
mg/L as CaCO₃ equivalent
Grains per gallon
32.4
1 GPG ≈ 17.1 PPM
How to use regional evidence
These samples describe nearby environmental water. They cannot establish whether your tap water is soft or hard. Use a utility result or a tap test for appliance settings and treatment sizing.
USGS sites used
2
Nearest site
22.9 mi
Observation range
Jul 8, 2024–Jun 3, 2026
Regional evidence confidence
Moderate
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: Unnamed Ck at FM 171, Wichita Falls, TX (Stream).USGS source documentation ↗Evidence tier: Regional environmental evidence. This value is not used as proof of the serving utility's treated-water hardness.
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
554 PPM
About the same1 indexed ZIP readings · Range 554.2–554.2 PPM
Oklahoma median
293 PPM
261 PPM higher47 indexed ZIP readings · Range 7–1700 PPM
Evidence-first next steps
Confirm the problem before choosing treatment
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
Use the current Consumer Confidence Report for treated-water results and official notices.
Find an official utility report →Test for the decision you face
Use a tap hardness test before sizing a softener. For health concerns, use a certified laboratory and the correct sampling protocol.
Convert your hardness test result →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?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.