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MADILL

PWS ID: OK1010820 · MADILL, Oklahoma 73446

MADILL serves 3,410 people in MADILL, Oklahoma using Surface Water water sources. It has 264 recorded EPA violations, including 235 health-based violations. No PFAS contamination was detected in UCMR5 testing.

Water Quality Snapshot: MADILL

MADILL is a local-owned community water system that delivers drinking water to 3,410 residents in MADILL, Oklahoma (Marshall County) through 1,713 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 264 total violations for this system , of which 235 (89%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 19 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is TTHM, recorded in 126 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

Across Oklahoma, EPA tracks 1,262 public water systems serving 3,699,452 people, with 336,706 cumulative violations and 113,804 health-based violations on record. About 98% of systems in the state carry at least one violation, and state-wide the average per system is 266.8 violations. MADILL's 264 violations sit below the Oklahoma average. Statewide, 101 of 166 UCMR5-tested systems have reported PFAS detections (60.8%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
3,410
Total Violations
264
Health-Based Violations
235
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
1,713
County
Marshall
School/Daycare
No
MCL Violations
194
Monitoring Violations
19
Treatment Tech Violations
41

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 126 2025
Total Haloacetic Acids (HAA5) MCL 68 2025
CARBON, TOTAL TT 24 2007
Interim Enhanced Surface Water Treatment Rule TT 12 2009
Surface Water Treatment Rule TT 5 1995
TTHM MR 5 2013
Total Haloacetic Acids (HAA5) MR 5 2013
Arsenic MR 5 2007
Chlorine MR 4 2023

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 91 samples detected PFAS.

Contaminant Date Result MRL Status
lithium 7/8/2025 <9 µg/L 9 µg/L Not Detected
NMeFOSAA 7/8/2025 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 7/8/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 7/8/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFTrDA 7/8/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFHpS 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOA 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/16/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 6/16/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/16/2025 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/16/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/16/2025 <0.005 µg/L 0.005 µg/L Not Detected
NFDHA 6/16/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFOA 5/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 5/5/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 5/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 5/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFOS 5/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 5/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 5/5/2025 <0.004 µg/L 0.004 µg/L Not Detected
4:2 FTS 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 5/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 5/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 5/5/2025 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 5/5/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 5/5/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 5/5/2025 <0.005 µg/L 0.005 µg/L Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records — or to file a complaint, request a Consumer Confidence Report, or check current monitoring status — go directly to the federal and state regulators that enforce the Safe Drinking Water Act for MADILL.

Federal Source of Truth

EPA SDWIS — Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID OK1010820 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Oklahoma Drinking Water Authority

Oklahoma's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find OK regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 TTHM MCL 126 SDWIS / OK1010820 / 2950
2025 Total Haloacetic Acids (HAA5) MCL 68 SDWIS / OK1010820 / 2456
2023 Chlorine MR 4 SDWIS / OK1010820 / 0999
2013 TTHM MR 5 SDWIS / OK1010820 / 2950
2013 Total Haloacetic Acids (HAA5) MR 5 SDWIS / OK1010820 / 2456
2009 Interim Enhanced Surface Water Treatment Rule TT 12 SDWIS / OK1010820 / 0300
2007 CARBON, TOTAL TT 24 SDWIS / OK1010820 / 2920
2007 Arsenic MR 5 SDWIS / OK1010820 / 1005
1995 Surface Water Treatment Rule TT 5 SDWIS / OK1010820 / 0200

How MADILL Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric MADILL Oklahoma avg Federal benchmark
Total violations 264 266.8 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 235 90.2 Indicates a contaminant exceeded a federal MCL
PFAS detection None 60.8% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,410 2,931 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,262 regulated public water systems in Oklahoma.

Federal MCL reference — Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is MADILL water safe to drink? ▼
MADILL (PWS ID: OK1010820) has 264 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 3,410 people using Surface Water sources.
How many people does MADILL serve? ▼
MADILL serves 3,410 people in MADILL, Oklahoma. It is a Local-owned system using Surface Water water sources with 1,713 service connections.
What type of violations does MADILL have? ▼
MADILL has 264 total violations: 235 health-based violations (MCL exceedances or treatment failures), 19 monitoring/reporting violations, and 41 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in MADILL water? ▼
No. MADILL was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does MADILL use? ▼
MADILL uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.

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Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by Kiznis Studio Editorial