States ›Oklahoma ›Marshall County ›Madill

Madill, OK Tap Water Quality 2026

Water quality report for Madill, OK — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Madill's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Madill PWSID: OK1010820 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 1.70 ppb, 11% of the action level and no violations are open. PFAS was sampled but not enough times for a compliance determination.

B

Madill earns a B for water quality

Graded on violations and lead, with state inspection findings. PFAS not tested.

Lead: 1.70 ppb — 11% of the federal action level
PFAS sampled, too few results to judge
79 violations since 2015, 53 health-based
No violations currently open
Madill's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 1.70 ppb — 11% of the federal action level
✓ Lower lead than 60% of Oklahoma utilities
Population Served
3567
~1713 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
79 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
11% of EPA action level
1.70 ppb
Action level: 15 ppb
The 90th-percentile lead result is 1.70 ppb, 11% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2026 Archived
Revised Total Coliform Rule MONITORING FAILURE — — 2026 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2025 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.072 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.096 MG/L 0.080 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.072 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.066 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.092 MG/L 0.080 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.07 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.092 MG/L 0.080 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.076 MG/L 0.060 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.069 MG/L 0.060 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2025 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.074 MG/L 0.060 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.068 MG/L 0.060 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.099 MG/L 0.080 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.068 MG/L 0.060 mg/L 2024 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.066 MG/L 0.060 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.094 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.097 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2024 Archived
Chlorine MONITORING AND REPORTING — 4.0 mg/L 2023 Resolved
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2023 Archived
1,2,4-Trichlorobenzene MONITORING AND REPORTING — 0.07 mg/L 2023–2025 Archived
cis-1,2-Dichloroethylene MONITORING AND REPORTING — 0.07 mg/L 2023–2025 Archived
Xylenes, Total MONITORING AND REPORTING — 10 mg/L 2023–2025 Archived
DICHLOROMETHANE MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
o-Dichlorobenzene MONITORING AND REPORTING — 0.6 mg/L 2023–2025 Archived
p-Dichlorobenzene MONITORING AND REPORTING — 0.075 mg/L 2023–2025 Archived
Vinyl chloride MONITORING AND REPORTING — 0.002 mg/L 2023–2025 Archived
1,1-Dichloroethylene MONITORING AND REPORTING — 0.007 mg/L 2023–2025 Archived
trans-1,2-Dichloroethylene MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
1,2-Dichloroethane MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
1,1,1-Trichloroethane MONITORING AND REPORTING — 0.2 mg/L 2023–2025 Archived
Carbon tetrachloride MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
1,2-Dichloropropane MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Trichloroethylene MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
1,1,2-Trichloroethane MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Tetrachloroethylene MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
CHLOROBENZENE MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
Benzene MONITORING AND REPORTING — 0.005 mg/L 2023–2025 Archived
Toluene MONITORING AND REPORTING — 1 mg/L 2023–2025 Archived
Ethylbenzene MONITORING AND REPORTING — 0.7 mg/L 2023–2025 Archived
Styrene MONITORING AND REPORTING — 0.1 mg/L 2023–2025 Archived
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2020 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.068 MG/L 0.060 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.081 MG/L 0.080 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2019 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.061 MG/L 0.060 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.088 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.086 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2018 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.064 MG/L 0.060 mg/L 2016 Resolved
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2016 Resolved
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.062 MG/L 0.060 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

79 violations are on record since 2015, of which 53 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Madill
PWSID OK1010820
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 3,567
Service connections 1,713
Systems serving this area 3
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Madill tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 1.70 ppb, 11% of the action level.
Does Madill water have PFAS? ▼
It was sampled, but no sampling point had enough results for a compliance determination.
Who supplies water to Madill? ▼
Madill (PWSID OK1010820), one of 3 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-06-19. No significant deficiencies were recorded.

What Should Madill Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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