F0/100
HENNESSEY — Water Quality Report 2026
Serving 2,058 people · Oklahoma
Water Source
Groundwater
County
—
System ID
OK2003704
Violations
91
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.69 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
4
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 1 — URGENTResolved
Exceeded the Maximum Contaminant Level (single sample)
When: January 1, 2022 – March 31, 2022Enforcement: Formal — state order issued
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – November 28, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Consumer confidence report — inadequate or unavailable
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2022 – September 16, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Consumer confidence report — inadequate or unavailable
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2021 – December 1, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About HENNESSEY
Is HENNESSEY water safe to drink?
HENNESSEY water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 91 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HENNESSEY detected?
2 contaminants were tested in HENNESSEY's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does HENNESSEY have any EPA violations?
Yes, HENNESSEY has 91 EPA violation(s) on record, with the most recent in 2022. Violation types include MCL, MR, MON. 70 are health-based violations.
How many people does HENNESSEY serve?
HENNESSEY serves approximately 2,058 people, Oklahoma.
What type of water does HENNESSEY provide?
HENNESSEY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is OK2003704.
How does HENNESSEY compare to other utilities in Oklahoma?
HENNESSEY scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Oklahoma state page for a full comparison of water systems.