Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Madill, OK 73446
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Marshall County.
Historical measurement record needs context
- Largest possible serving system
- Madill
- Source water
- Surface water
- County
- Marshall 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 3,410 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.
Madill
OK1010820 · Surface water · 3,410 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 (3)
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
- 0.0017 mg/L
- Action level
- 0.015 mg/L
11% of the listed benchmark
Monitoring period: Jan 1, 2021 to Dec 31, 2023
Total Haloacetic Acids (HAA5)
EPA SDWIS reported health-based violation
- Reported level
- 0.061 MG/L
- Maximum contaminant level
- 0.06 MG/L
102% of the listed benchmark
Monitoring period: Oct 1, 2025 to Dec 31, 2025
TTHM
EPA SDWIS reported health-based violation
- Reported level
- 0.096 MG/L
- Maximum contaminant level
- 0.08 MG/L
120% of the listed benchmark
Monitoring period: Oct 1, 2025 to Dec 31, 2025
Violation history (56)
| Rule | Status | Period |
|---|---|---|
| Chlorine | Archived | Jan 1, 2026 to Jan 31, 2026 |
| Revised Total Coliform Rule | Archived | Jan 1, 2026 to Jan 31, 2026 |
| Total Haloacetic Acids (HAA5) | Resolved | Dec 30, 2025 to Feb 4, 2026 |
| TTHM | Resolved | Dec 30, 2025 to Feb 4, 2026 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Oct 1, 2025 to Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Oct 1, 2025 to Dec 31, 2025 |
| TTHMHealth-based | Archived | Oct 1, 2025 to Dec 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Jul 1, 2025 to Sep 30, 2025 |
| TTHMHealth-based | Archived | Jul 1, 2025 to Sep 30, 2025 |
| TTHMHealth-based | Archived | Jul 1, 2025 to Sep 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Jul 1, 2025 to Sep 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Apr 1, 2025 to Jun 30, 2025 |
| TTHMHealth-based | Archived | Apr 1, 2025 to Jun 30, 2025 |
| TTHMHealth-based | Archived | Apr 1, 2025 to Jun 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Apr 1, 2025 to Jun 30, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Jan 1, 2025 to Mar 31, 2025 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Jan 1, 2025 to Mar 31, 2025 |
| TTHMHealth-based | Archived | Jan 1, 2025 to Mar 31, 2025 |
| TTHMHealth-based | Archived | Jan 1, 2025 to Mar 31, 2025 |
| TTHMHealth-based | Archived | Oct 1, 2024 to Dec 31, 2024 |
| TTHMHealth-based | Archived | Oct 1, 2024 to Dec 31, 2024 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Oct 1, 2024 to Dec 31, 2024 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Oct 1, 2024 to Dec 31, 2024 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Jul 1, 2024 to Sep 30, 2024 |
| TTHMHealth-based | Archived | Jul 1, 2024 to Sep 30, 2024 |
| TTHMHealth-based | Archived | Jul 1, 2024 to Sep 30, 2024 |
| Total Haloacetic Acids (HAA5)Health-based | Archived | Jul 1, 2024 to Sep 30, 2024 |
| TTHMHealth-based | Archived | Apr 1, 2024 to Jun 30, 2024 |
| TTHMHealth-based | Archived | Apr 1, 2024 to Jun 30, 2024 |
| TTHMHealth-based | Archived | Apr 1, 2023 to Jun 30, 2023 |
| Chlorine | Resolved | Apr 1, 2023 to Jun 30, 2023 |
| 1,2,4-Trichlorobenzene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Xylenes, Total | Archived | Jan 1, 2023 to Dec 31, 2025 |
| DICHLOROMETHANE | Archived | Jan 1, 2023 to Dec 31, 2025 |
| p-Dichlorobenzene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Vinyl chloride | Archived | Jan 1, 2023 to Dec 31, 2025 |
| trans-1,2-Dichloroethylene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| 1,1,1-Trichloroethane | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Carbon tetrachloride | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Trichloroethylene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| 1,1,2-Trichloroethane | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Tetrachloroethylene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Benzene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Ethylbenzene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| CHLOROBENZENE | Archived | Jan 1, 2023 to Dec 31, 2025 |
| cis-1,2-Dichloroethylene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| 1,2-Dichloropropane | Archived | Jan 1, 2023 to Dec 31, 2025 |
| o-Dichlorobenzene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| Toluene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| 1,2-Dichloroethane | Archived | Jan 1, 2023 to Dec 31, 2025 |
| TTHMHealth-based | Archived | Jan 1, 2023 to Mar 31, 2023 |
| Styrene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| 1,1-Dichloroethylene | Archived | Jan 1, 2023 to Dec 31, 2025 |
| TTHMHealth-based | Archived | Jan 1, 2023 to Mar 31, 2023 |
| TTHMHealth-based | Archived | Oct 1, 2022 to Dec 31, 2022 |
| TTHMHealth-based | Archived | Jul 1, 2022 to Sep 30, 2022 |
Hardness meter
What does nearby environmental evidence show?
296
PPM as CaCO₃
Very Hard
PPM
296
GPG
17.3
Regional environmental evidence
USGS hardness classification scale
296 PPM
Soft
0–60Moderate
61–120Hard
121–180Very hard
181+
0–60Moderate
61–120Hard
121–180Very hard
181+
Parts per million
296
mg/L as CaCO₃ equivalent
Grains per gallon
17.3
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
5
Nearest site
10.8 mi
Observation range
Aug 28, 2018–Sep 17, 2025
Regional evidence confidence
Moderate
Median of the latest source-type-aligned hardness observation at each monitoring site within 25 miles. Nearest monitoring location: Lk Texoma at Hwy 70 Bridge nr Little City, OK (Lake, Reservoir, Impoundment).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 73446 typical?
These comparisons use other indexed ZIP estimates, not utility tap samples. They help show local context without replacing a household test.
Madill median
296 PPM
About the same1 indexed ZIP readings · Range 296–296 PPM
Oklahoma median
293 PPM
About the same47 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 Madill
Is tap water safe in Madill?+
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.