States ›Oklahoma ›Garvin County ›Hennepin

Hennepin, OK Tap Water Quality 2026

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

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

Main Utility: West Davis Rwd PWSID: OK3005004 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 2.00 ppb, 13% of the action level and no violations are open. PFAS has never been sampled at this system.

C

Hennepin earns a C for water quality

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

Lead: 2.00 ppb — 13% of the federal action level
PFAS never sampled at this system
80 violations since 2015, 52 health-based
No violations currently open
Hennepin's lead level vs. all Oklahoma community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 2.00 ppb — 13% of the federal action level
✓ Lower lead than 51% of Oklahoma utilities
Population Served
96
~506 connections
Water Source
Surface water
Purchased from another system — SDWIS source code SWP
Active Violations
0
80 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
13% of EPA action level
2.00 ppb
Action level: 15 ppb
The 90th-percentile lead result is 2.00 ppb, 13% 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
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2026 Archived
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2026 Archived
TTHM MONITORING AND REPORTING — 0.080 mg/L 2025 Unaddressed
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.084 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.089 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.096 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.101 MG/L 0.080 mg/L 2025 Archived
TTHM MCL EXCEEDANCE 0.1 MG/L 0.080 mg/L 2025 Archived
Nitrate-Nitrite MONITORING AND REPORTING — — 2025 Archived
LEAD AND COPPER RULE REVISIONS TREATMENT TECHNIQUE — — 2024 Addressed
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2024 Addressed
TTHM MCL EXCEEDANCE 0.105 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.107 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2024 Archived
TTHM MCL EXCEEDANCE 0.097 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.096 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.098 MG/L 0.080 mg/L 2023 Archived
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2023 Archived
Gross Alpha, Excl. Radon and U MONITORING AND REPORTING — 15 pCi/L 2023–2025 Archived
Combined Uranium MONITORING AND REPORTING — 30 ug/L 2023–2025 Archived
Combined Radium (-226 and -228) MONITORING AND REPORTING — 5 pCi/L 2023–2025 Archived
Gross Beta Particle Activity MONITORING AND REPORTING — 4 mrem/yr 2023–2025 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 0.089 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.085 MG/L 0.080 mg/L 2022 Archived
TTHM MCL EXCEEDANCE 0.082 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.094 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.091 MG/L 0.080 mg/L 2021 Archived
TTHM MCL EXCEEDANCE 0.087 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.083 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.118 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.105 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.096 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.11 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.12 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.097 MG/L 0.080 mg/L 2020 Archived
TTHM MCL EXCEEDANCE 0.142 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.115 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.095 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.136 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.106 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.142 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.132 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.109 MG/L 0.080 mg/L 2019 Archived
TTHM MCL EXCEEDANCE 0.134 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.116 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.109 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.117 MG/L 0.080 mg/L 2018 Archived
TTHM MCL EXCEEDANCE 0.108 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.102 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.093 MG/L 0.080 mg/L 2017 Archived
TTHM MCL EXCEEDANCE 0.09 MG/L 0.080 mg/L 2016 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.078 MG/L 0.060 mg/L 2016 Archived
Total Haloacetic Acids (HAA5) MCL EXCEEDANCE 0.101 MG/L 0.060 mg/L 2016 Archived
TTHM MCL EXCEEDANCE 0.11 MG/L 0.080 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

80 violations are on record since 2015, of which 52 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility West Davis Rwd
PWSID OK3005004
Water source Surface water — Purchased from another system — SDWIS source code SWP
Population served 96
Service connections 506
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Hennepin tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 2.00 ppb, 13% of the action level.
Does Hennepin water have PFAS? ▼
This system has never been sampled for PFAS. EPA's national monitoring covered systems serving 3,300 people or more, so no results exist — which is not evidence that none is present.
Who supplies water to Hennepin? ▼
West Davis Rwd (PWSID OK3005004), one of 2 systems serving this area. Surface water. Purchased from another system — SDWIS source code SWP
When was this system last inspected? ▼
It was last inspected on 2025-05-29. Inspectors recorded 1 significant deficiency.

What Should Hennepin 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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